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Old 02-24-2013, 10:30 AM   #57
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Well, it's a done deal! We bought a Thor Redwood 36FL 5er over the weekend. We decided that if we're going to have a good chance at liking full time RV living, we'd better really enjoy the space we live in. It should be here in about 6-8 weeks.
The pin weight will put us well below the GAWR (rear) at about 5500lbs and just about right at the towing maximum recommended by Ram (13800 dry - we'll have little in the trailer on the trip to Oregon).We also got a slider-hitch as we (Duh!) have a short, not long box (6.5ft) as I originally thought.
As far as gear ratios, we've decided to wait to see how it hauls with the 3.73 gears before we put in 4.10 gears (a $3500 est'd bill). (thanks for the advice above).
What put the final nail in the coffin as far as weight was a guy who pulled into the dealership with a F2500 (non HD) SRW (5.9L gas) who just pulled a 15000 lb 5th wheel from IN and says he does it all the time with no problems (65-70mph on the freeway - I'll be going around 55 regardless).
Again, thanks for the input from everyone here. It was incredibly helpful and informative. We feel really confident that the truck/trailer combo. we have will be safe and enjoyable - now for the hard part....waiting!
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Old 02-24-2013, 10:37 AM   #58
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oh...one last (maybe) question. The truck originally was supposed to have LT265 70R 17E tires. It has 285 70R 17 tires (load rated D). What difference,if any, will that make as far as towing etc?
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Old 02-24-2013, 11:08 AM   #59
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An LT265/70R-17E is rated for a maximum load of 3195 lbs @ 80 PSIG (single). The LT285/70R-17D is rated for a maximum load of 3195 lbs @ 65 PSIG (single). So you're OK on maximum load capacity.

The two areas where you'll notice a difference are the softer sidewalls of the D-rated tire as compared to the E. This can cause more side-to-side yaw when towing. The other area is the slightly larger diameter of the 285 tire that has the same effect as a higher (lower numerically) rear axle ratio.

It sounds like you're going to be operating over the GVWR and GCWR of the truck if you have a "dry trailer weight" of 13,800 lbs. What's the trailer's GVWR? I truly regret that, instead of listening to the manufacturer, you've succumbed to the "I tow overloaded and don't have any problems" school of thought, but it's your money, your family's safety and your choice. Good luck with it....

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Old 02-24-2013, 12:25 PM   #60
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I have to agree with Rusty's comments. You now know and hopefully understand the towing limits on trucks. They are there for a reason. The I tow over my limits crowd gains one more member.

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Old 02-24-2013, 05:28 PM   #61
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As far as gear ratios, we've decided to wait to see how it hauls with the 3.73 gears before we put in 4.10 gears (a $3500 est'd bill). (thanks for the advice above).
What put the final nail in the coffin as far as weight was a guy who pulled into the dealership with a F2500 (non HD) SRW (5.9L gas) who just pulled a 15000 lb 5th wheel from IN and says he does it all the time with no problems (65-70mph on the freeway - I'll be going around 55 regardless).
Again, thanks for the input from everyone here. It was incredibly helpful and informative. We feel really confident that the truck/trailer combo. we have will be safe and enjoyable - now for the hard part....waiting!
You made a sound and completely safe choice. You and your family will be just as safe as thousands of other truck owners can expect to be regardless or truck/trailer size.

The 6.7 engine/tranny/AAM 11.5" rear axle/front axle is the same as the DRW truck with the 3.73 gears so you sure won't have any issues pulling that size 5er or carrying pin weights within Dodges axle/tire load limits.
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Old 02-24-2013, 10:18 PM   #62
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The truck originally was supposed to have LT265 70R 17E tires. It has 285 70R 17 tires (load rated D). What difference,if any, will that make as far as towing etc?
A change in tire diameter changes the effective rear axle ratio by the percent change in the tire revs/mile.

LT 265/70R17 = 654 revs/mile
LT285/70R17 = 635 revs/mile

654 minus 635 = 19
19 divided by 654 = 2.9%

So your 3.73 rear axle will "feel like" a 3.62 ratio, i.e. less power and torque at the same engine RPM, so less GCWR. Less engine RPM at the same corrected speed, so less HP at the same speed. 2.9% doesn't sound like much, but since you'll be severely overloaded with that 5-slide 16k 5er, it could be the straw that broke the camel's back.

Also, if you don't calibrate the speedometer, your speedometer will be slow by 2.9%. So if it were accurate at 70 MPH with stock-size tires, it will be 2.9% slow with the taller tires. 70 MPH per the speedo will be an actual 72 MPH on Officer Bob's radar gun.

Same percentage for the tripmeter and odometer. 400 miles per the tripmeter would be an actual 411.6 miles per your GPS or navigation system or interstate highway mileage marker signs. That messes up your MPG computations. 60,000 miles per the odometer would be an actual 61,740 miles. So you'd be a crooked thief if you sell the truck without warning the buyer of the actual mileage on the truck.
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Old 02-25-2013, 06:49 AM   #63
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Not enough air pressure in the tires and it will heat them up. I would never pull that weight on D load tires. Fuel mileage with only 60 lbs will suffer. The unit will be unstable for sure. Get load E tires stock size and you will not regret.
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Old 02-25-2013, 08:33 AM   #64
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The more you hang around RV people the more you will see SRW trucks towing big 5th wheels. Last winter in Florida there were dozens of SRW trucks from northern states that towed 1,000 - 1,400 miles one way.

The one that sticks out was two couples traveling in a F-350 SRW towing a Redwood Front Living Room model. They were in Tampa from Philadelphia.

One person towed his mid size 5er from way up state Michigan plus his big motorcycle in a trailer with a SRW Chevy diesel 2500 with air bags. He just bought a F-350 dually while in Florida two weeks ago.

I will also say the RV people that have been doing towing for a longer time usually had a dually.

Cool - you got a Redwood. Very very nice trailer. I think you guys will enjoy RV'ing and that is good thinking that you will be living in it so get a top of the line 5er.

I have not been to Oregon yet but heard it is great in the summer. Enjoy !!!
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Old 02-25-2013, 08:57 AM   #65
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"but since you'll be severely overloaded with that 5-slide 16k 5er, it could be the straw that broke the camel's back".

Thanks for the info. on tires. I'm not sure what you are basing the above on, but the RV with all options will be just under 14K, not 16K.
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Old 02-25-2013, 09:02 AM   #66
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Is the 14K the GVWR of the 5th wheel?

Rusty
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Old 02-25-2013, 09:03 AM   #67
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Quote:
Originally Posted by SmokeyWren View Post
A change in tire diameter changes the effective rear axle ratio by the percent change in the tire revs/mile.

LT 265/70R17 = 654 revs/mile
LT285/70R17 = 635 revs/mile

654 minus 635 = 19
19 divided by 654 = 2.9%

So your 3.73 rear axle will "feel like" a 3.62 ratio, i.e. less power and torque at the same engine RPM, so less GCWR. Less engine RPM at the same corrected speed, so less HP at the same speed. 2.9% doesn't sound like much, but since you'll be severely overloaded with that 5-slide 16k 5er, it could be the straw that broke the camel's back.

Also, if you don't calibrate the speedometer, your speedometer will be slow by 2.9%. So if it were accurate at 70 MPH with stock-size tires, it will be 2.9% slow with the taller tires. 70 MPH per the speedo will be an actual 72 MPH on Officer Bob's radar gun.

Same percentage for the tripmeter and odometer. 400 miles per the tripmeter would be an actual 411.6 miles per your GPS or navigation system or interstate highway mileage marker signs. That messes up your MPG computations. 60,000 miles per the odometer would be an actual 61,740 miles. So you'd be a crooked thief if you sell the truck without warning the buyer of the actual mileage on the truck.
I thought the "285" number is a measure of tire width, not diameter(?)
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Old 02-25-2013, 09:06 AM   #68
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The sidewall height is 70% of the width (that's what the 70 stands for - the aspect ratio). Therefore, a 285/70 tire will have taller sidewalls (and, thus, a greater radius and diameter) than a 265/70 tire.

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Old 02-25-2013, 09:08 AM   #69
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Is the 14K the GVWR of the 5th wheel?

Rusty
No, the 14K is the approximate dry weight (with options). We will take a UHaul as well for belongings so the 5th wheel will remain around 14K. The GVWR is 16K.
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Old 02-25-2013, 09:10 AM   #70
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The sidewall height is 70% of the width (that's what the 70 stands for - the aspect ratio). Therefore, a 285/70 tire will have taller sidewalls (and, thus, a greater radius and diameter) than a 265/70 tire.

Rusty
ahhh...gotcha. Thanks.
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