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Old 05-15-2021, 03:28 PM   #1
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2003 Alpine 36MDDS weight

Cat scale weight
Front 9,880 (12,000# axle)
Rear 17,280 (19,000# axle)

Fresh water - basically full
Fuel -around 90 gallons
Black water - empty
Gray water - empty
Very little amount of “stuff” on board
Driver & passenger around 300#’s combined

We are weekend campers so we do not have much on board. For us it is more like a moving hotel room as opposed to some of your full time houses.

I knew the tire pressure tag at the front was based on GVWR numbers, to which we are not close. I felt that if we knew our weight, I could lower the pressures to smooth out the ride.

So off we went this morning to a Cat scale. This was my first time at a scale. I must say even though I saw the videos on line about how easy it is, it really was that easy and quick.

Running Toyo M177 295R75/22.5 all around

According to Toyo’s load chart:

9,880 is 75 psi — I plan on running 95 psi (which is good for 11,020)

17,280 is 80 psi —I plan on running 85 psi (which is good for 18,760)

Anyone see a problem with my plan?

Thanks
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Old 05-15-2021, 03:48 PM   #2
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Wow, your weight is much more than I expected. I have a 2001 36ft. Better get it weighed. My basements are full.
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Old 05-15-2021, 03:54 PM   #3
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I've got this info from 2001 - are you sure about the 12K front?

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Old 05-15-2021, 05:49 PM   #4
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Yes. According to the weight label at the front by the fuel fill. Also the 2003 brochure matches. The weight sticker in the kitchen cabinet also states the same
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Old 05-15-2021, 05:53 PM   #5
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Hopefully the weight plates shows. Here you can see the total. 12,000 + 19,000 = 31,000. They must have changed between 2001 and 2003.
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Old 05-15-2021, 06:12 PM   #6
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Quote:
Originally Posted by Astasoftride View Post
Hopefully the weight plates shows. Here you can see the total. 12,000 + 19,000 = 31,000. They must have changed between 2001 and 2003.
My 2004 is not close by so I don't know the front/rear axle weight ratings, but on the 2005, the front axle is rated @13,000 lbs., rear 19,000 lbs. so changes were made after 2003 as well.


Could someone with direct information let me know the front axle weight on a 2004 Alpine 36FDDS? The chassis/features are a bit different than 2003 and nearly identical to the 2005, so my guess is I have the higher front axle weight rating but I'd like to know before I travel to storage.
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Old 05-15-2021, 06:59 PM   #7
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In 2004 WRV listed the front axle at 13K, rear at 20K, per the brochure. Those ratings remained constant through 2009.

Astasoftride, I do not see a problem with your plan. Do you have a TPMS?
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Old 05-15-2021, 07:02 PM   #8
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In 2004 WRV listed the front axle at 13K, rear at 20K.
Thanks
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Old 05-15-2021, 09:08 PM   #9
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In 2004 WRV listed the front axle at 13K, rear at 20K, per the brochure. Those ratings remained constant through 2009.

Astasoftride, I do not see a problem with your plan. Do you have a TPMS?
Yes there is a tpms installed. Low alarm set at 75 psi front and 80 rear.
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Old 05-16-2021, 09:21 AM   #10
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Just an opinion here--based on your weights, I'd go with 100 front and 85 rear, based on cold tires at ambient temps....then set alarms at 10% lower and 20% higher.....doesn't hurt to be a bit high but a bit low doesn't give you much margin for error with a slow leak--as low tires will flex more and run hotter.
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Old 05-17-2021, 09:37 AM   #11
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I have thought about this some more.

OldScout. I will run 100psi for my trip coming up to see how that works.

For the rear, I’ve decided to up the pressure to 90. When I thought about it some more, I weighed it with the black/gray tanks dry. I figure that bumping the rear up should take care of the possibility of fluid in those tanks.

I can only see the front getting lighter with the usage of fuel/lpg/fresh water. The rear however it seems can only get heavier due to fluids being added to the waste tanks.
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Old 05-17-2021, 11:19 AM   #12
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Originally Posted by Astasoftride View Post
I have thought about this some more.

OldScout. I will run 100psi for my trip coming up to see how that works.

For the rear, I’ve decided to up the pressure to 90. When I thought about it some more, I weighed it with the black/gray tanks dry. I figure that bumping the rear up should take care of the possibility of fluid in those tanks.

I can only see the front getting lighter with the usage of fuel/lpg/fresh water. The rear however it seems can only get heavier due to fluids being added to the waste tanks.
The only reason I can see to travel with fluids in the black and gray tanks would be if you’ve been boondocking and had no opportunity to dump. Sure, keep 5-10 gallons of water in the black tank to keep things loose in there. Bear in mind that all fresh, black and grey water is located between the axles. The fresh tank and the waste tanks are not that far apart. In other words, you’re not moving 800lbs from the front axle to the rear axle. You’d have to take it to the scales under both conditions to know for sure, but I’d wager you’re transferring more weight from front to rear when you get out of the passenger seat and walk back to take a leak.

I do question running the fronts at 100, if the recommended minimum pressure is 75. That would be 33% above the recommended chart pressure. Based on what I’ve read from Tireman9 (Roger Marble) I wouldn’t go more than 20% above the pressure recommended on the chart.

I did recently discover a way to take ~270lbs off the rear axle. Remove 360lbs of GC2 batteries (6) and replace them with 90lbs of lithium batteries (4). It cost a bit over $10/lb, but the results are permanent.
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Old 05-17-2021, 06:05 PM   #13
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Think my 2003 40ft MDTS is about 10.5k front an18.5-19k rear when loaded for trips--don't have the tire charts in front of me but really cant believe the recommended weight for the front tires is 75 PSI. Figure the front and back axles are around 2 to 1 for weight and 4 tires vs 2 so chart PSI's should be close, though duals are often a bit higher due to the need to care one side of axle in case of a blow out?????
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Old 05-17-2021, 06:25 PM   #14
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Think my 2003 40ft MDTS is about 10.5k front an18.5-19k rear when loaded for trips--don't have the tire charts in front of me but really cant believe the recommended weight for the front tires is 75 PSI. Figure the front and back axles are around 2 to 1 for weight and 4 tires vs 2 so chart PSI's should be close, though duals are often a bit higher due to the need to care one side of axle in case of a blow out?????
From owning an F350, I thought the duel tire pressure was more due to potential tire interactions. Meaning with lower pressures (for the same weight) the tire would bulge out a bit more. This then could lead to the two tires rubbing which would be a bad thing or at least the space between the two being greatly reduced.

I think I wrote the wrong number earlier. For the Toyo 295R80/22.5 @ 9880 it is 80 psi.
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