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Old 06-23-2022, 04:44 AM   #1
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Golf Cart in GMC Sierra Loading Advice

We are flat towing our GMC Sierra with a golf cart in the rear occasionally. Took it to the truck scales to check weight. With a full tank of diesel and myself as a driver it weighed 7,240. GWVC is 7,200. I weigh 200 so when flat towing we are down to 7,040. I could also save 75 gallons if I keep the diesel at 1/2 tank. So I think I am OK for towing only. I would not drive the truck any distance with the cart in the back

It does squat a little in the rear.

Questions:

1. Should I consider adding air to the rear tires? Current spec is 36 PSI on all four.
2. Should I consider an air leveling system?
3. Is the squat during flat towing causing any long term issues or is it just a visual annoyance (to me)?
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Old 06-23-2022, 04:51 AM   #2
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Quote:
Originally Posted by RVStitchy View Post
We are flat towing our GMC Sierra with a golf cart in the rear occasionally. Took it to the truck scales to check weight. With a full tank of diesel and myself as a driver it weighed 7,240. GWVC is 7,200. I weigh 200 so when flat towing we are down to 7,040. I could also save 75 gallons if I keep the diesel at 1/2 tank. So I think I am OK for towing only. I would not drive the truck any distance with the cart in the back

It does squat a little in the rear.

Questions:

1. Should I consider adding air to the rear tires? Current spec is 36 PSI on all four.
2. Should I consider an air leveling system?
3. Is the squat during flat towing causing any long term issues or is it just a visual annoyance (to me)?
We tow a 2020 Silverado with a Harley ( 900 ) lbs in the bed. It does squat a little, but I'm under my payload. I increased the rear tire pressure to 42. Mine is a double cab, 6.5 bed, so my load is a little farther forward than yours, but you should be fine without causing any damage. Occasionally we take the truck to dinner or to run errands with the bike loaded. Not the greatest ride, but not all bad either.
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Old 06-23-2022, 04:56 AM   #3
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You say you wouldn't drive the truck any distance with the cart in the back. Why? does the front end feel light? The may affect towing stability. When you weighed the truck did you get axle weights? Compare those weights to axle capacity.
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Old 06-23-2022, 05:34 AM   #4
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Quote:
Originally Posted by Fotoryder View Post
You say you wouldn't drive the truck any distance with the cart in the back. Why? does the front end feel light? The may affect towing stability. When you weighed the truck did you get axle weights? Compare those weights to axle capacity.
Because I am slightly over GVWR with just a driver. When we are camping and taking the toad into town I would also have DW in truck passenger seat and two dogs in the back adding another 200-225 lbs.

GAWR in the rear is 3,800. I am weighing in at 3,900 with the golf cart. With a half tank it would be closer to 3,825.

In a couple weeks I am adding Valor Tire sensors and programming the system to see the truck so I need to decide if I have it programmed to 36 PSI or something higher.
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Old 06-23-2022, 06:33 AM   #5
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Part of the rear weight issue is clearly how far back the long cart sits, leveraging weight on the rear axle.

Air bags in the rear won't increase capacity, but they MIGHT shift some weight forward, but I'd question how much with the load so far back. And if you are over in total, that's not going to make total weight lower.

I installed air bags on my Silverado 2500 HD 4x4 8' bed pickup when I had a large 5th wheel. I was at the GAWR on the rears and the airbags took the squat out...didn't really shift significant weight forward with all the pin load right over the axle though.

I'd get the weight down by keeping the fuel tank only partially full when hauling and install the air bags to help the truck be level vs squatted. Keep in mind that bad roads that make the rear "bounce" under load taxes a suspension even more. If you are over an axle's weight rating, it's not good for suspension or braking. The squat may also be changing the angle of the drive shaft to a limit and putting stress on that system.
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Old 06-23-2022, 06:56 AM   #6
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Thanks NCC - good feedback.

The ramps are folded up and stowed on top of the wheel wells. That is another 76 lbs right over the drive axle. I just had a thought. I have a bicycle rack that I can install on the hitch of the RV that we never use. I might try to stow the ramps on the bike rack instead of in the truck bed. That would probably be easier on my back and less of a chance to scratch the truck or cart.
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Old 06-23-2022, 09:29 AM   #7
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Quote:
Originally Posted by RVStitchy View Post
We are flat towing our GMC Sierra with a golf cart in the rear occasionally. Took it to the truck scales to check weight. With a full tank of diesel and myself as a driver it weighed 7,240. GWVC is 7,200. I weigh 200 so when flat towing we are down to 7,040. I could also save 75 gallons if I keep the diesel at 1/2 tank. So I think I am OK for towing only. I would not drive the truck any distance with the cart in the back

It does squat a little in the rear.

Questions:

1. Should I consider adding air to the rear tires? Current spec is 36 PSI on all four.
2. Should I consider an air leveling system?
3. Is the squat during flat towing causing any long term issues or is it just a visual annoyance (to me)?
I would check your rear axle weight - you may well be considerably over. If not, do you have the heavier part of the cart forward in the truck (i.e. the batteries)? Can you back it in?
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Old 06-23-2022, 09:55 AM   #8
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With the caveat that I don't play golf, how heavy is a golf cart? I would have thought it would not be an issue.
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Old 06-23-2022, 10:19 AM   #9
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That Denali diesel must be one heavy 1/2 ton if you are over GVWR with just the golf cart. Is that an Icon? Even with the rear jumpseat, can't see that weighing over 750 lbs or so. Do you have a lot of extra add-ons/gear in the vehicle?

I realize it was only good the day it rolled off the line, but am curious what your truck's Tire & Loading Info sticker states is your truck's payload capacity?
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Old 06-23-2022, 10:22 AM   #10
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How much weight can the tailgate supports take?

Chevy had a problem back in the 1900's with the support cable breaking.
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Old 06-23-2022, 11:10 AM   #11
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That Denali diesel must be one heavy 1/2 ton if you are over GVWR with just the golf cart. Is that an Icon? Even with the rear jumpseat, can't see that weighing over 750 lbs or so. Do you have a lot of extra add-ons/gear in the vehicle?

I realize it was only good the day it rolled off the line, but am curious what your truck's Tire & Loading Info sticker states is your truck's payload capacity?
Good question. The base payload with the Diesel is 1820 pounds. However, that does not account for the Denali branding.

If a golf cart is in the 750-1000 pound range, should be fine. Probably would be better with a Double Cab, standard bed, might get the wheels off the tailgate and shift more of the weight to the front axle. But at under half a ton for the golf cart, should be fine.

If this is an issue for OP's truck, I may need to rethink a plan I have to haul 1200 pounds of landscaping stone in my truck.
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Old 06-23-2022, 11:12 AM   #12
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Quote:
Originally Posted by RVStitchy View Post
We are flat towing our GMC Sierra with a golf cart in the rear occasionally. Took it to the truck scales to check weight. With a full tank of diesel and myself as a driver it weighed 7,240. GWVC is 7,200.
Several comments:

1) I'm not familiar with "GWVC" but I think you're referring to Gross Vehicle Weight Rating (GVWR).

2) If the GVWR is 7,200 pounds and you're at 7,240, the extra 40 pounds equals 0.55% - about half of one percent. If you're thinking you're okay at 7,200 but in danger at 7,240, my opinion is that you're overthinking it. Not that I'm recommending anyone deliberately exceed the weight rating of any vehicle, but I'd be surprised if the scale you used to weigh the truck is accurate to plus or minus half of one percent.

3) You didn't indicate the power source of your golf cart - gas, lead-acid batteries, or lithium batteries. If it's gas, or particularly if it's lead-acid batteries, you could save way more than 40 pounds by going with a cart that has lithium batteries, or perhaps converting yours to lithium.

Amy & I have an E-Z-GO golf cart with a longer wheelbase than yours (see attached photo). The lithium battery in our cart weighs 40 pounds. 6 volt lead acid batteries typically weigh about 70 pounds a piece and electric golf carts usually have at least six of them if not eight. BIG difference.
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Old 06-23-2022, 01:02 PM   #13
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To answer a few of the questions:

1. Yes GVWR - typo
2. Payload is 1360, curb weight is 5,840. It is a Sierra 1500 Denali with all the goodies and I guess those extras weigh a bit more.
3. Golf Cart is a "Star EV" - lithium batteries with extra suspension. Was told at the time of purchase it was "about 1,100 lbs". Makes sense since I am slightly over payload based on being slightly over GVWR with 200lb driver and about 100lbs of ramps and other gear.
4. Tailgate is supported with a cross bar and hard bars on the end. Forgot the brand name but mentioned frequently on these forums. No weight on cable. Metal on tailgate showed no signs of caving under tires during the first 1,000 mile trip.

Sorry for the sideways pics.

Any more feedback on tire pressure and need for leveling systems appreciated.
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Old 06-23-2022, 02:23 PM   #14
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Quote:
Originally Posted by RVStitchy View Post
To answer a few of the questions:

1. Yes GVWR - typo
2. Payload is 1360, curb weight is 5,840. It is a Sierra 1500 Denali with all the goodies and I guess those extras weigh a bit more.
3. Golf Cart is a "Star EV" - lithium batteries with extra suspension. Was told at the time of purchase it was "about 1,100 lbs". Makes sense since I am slightly over payload based on being slightly over GVWR with 200lb driver and about 100lbs of ramps and other gear.
4. Tailgate is supported with a cross bar and hard bars on the end. Forgot the brand name but mentioned frequently on these forums. No weight on cable. Metal on tailgate showed no signs of caving under tires during the first 1,000 mile trip.

Sorry for the sideways pics.

Any more feedback on tire pressure and need for leveling systems appreciated.
WOW! Surprised the Denali drops the payload that much. That's a lot of goodies. My GMC Canyon had a higher payload than that at around 1400 pounds.

As a Denali, that means you have the multi-function tailgate. I have to believe that adds a good bit of weight. My Silverado has a conventional tailgate and the tires would be resting on a plastic ribbed sheet similar to what you might see on a drop in bedliner. Not sure how the multi-function tailgate compares to the regular bed in regards to strength.
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