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Old 11-13-2012, 08:55 AM   #1
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Alpine Owners Club
Join Date: Aug 2010
Location: Cincinnati, OH
Posts: 183
Weight vs Tire psi - 2005 Alpine Coach 36' FDDS

I had my coach weighted at a rally. It's weight was:
Front Passenger Side = 5200
Froint Drivers Side = 5950
Rear Passenger Side = 9475
Rear Drivers Side = 9075

Do these weights seem normal or close?
They said to shift 375# from FDS to FPS. I don't know how I could do that.
They said to shift 200# fro RPS to RDS. That also seems impossibe.
I understand the math but is anyone's coach perfect?

Using the above weights:

The tire pressure recommendations were:
Front Tires = 100psi & Rear Tires = 80psi

I have been running 100psi in all the tires since the coach was new.

Is 100psi OK or should I change?
Will lowering the pressure lower my fuel milage?
Should I just keep doing what I have been doing for 6 or 7 years?
All the tires are wearing OK.


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Old 11-13-2012, 12:15 PM   #2
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Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 15,547
JMHO. 80psi in the rear seams low , and yes it could drop the fuel mileage.
Removing weight from one side or the other may not be possible , but with carefull loading you may be able to balance the weights side to side , front to rear.
Was the coach full of fuel and propane when weighed?
Were you loaded up for travel?
Look at all the items you normally carry, and place, the heaviest of them, in the compartments closest to the wheels that showed the lower weights.
Because of the single slide and propane tank location on the drivers side of my coach, it's LS heavy front and rear, I keep the heavy items in the compartments on the right, and that's easy because they have the larger doors for access.
If the 100 psi your running, is not giving you a harsh ride stick with it .

99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 11-13-2012, 01:06 PM   #3
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Posts: 967
Just some thoughts....

1) You have the first part correct...4 corner weights.

2) I'd do what I could to balance the weights wherever possible and then quite worrying about it.

3) I'd be much more concerned about the age of your current tires. At 7yrs you are starting to push the safety limits. Have you had them professionally inspected...are they OK?

4) Have you pulled the weight/pressure charts for " your" current tires and confirmed the recommended PSI? In other words...who(?) recommended 100 front & 80 rear?

Good luck...pls get those 7th old tires inspected!
Jack & Maggie
04-Rexhall Roseair (37)
Cummins ISC / Spartan
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Old 11-13-2012, 02:06 PM   #4
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Location: Charleston, WV
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I run my tires with 95 in the front and 85 in the rear. Your weights are higher than mine so running 100 front and rear seems good. I could lower my rear pressures to 80 as you could but I prefer a little safety margin. The fuel and water tanks are down the center line so I expect the extra weight on the driver's front wheel is the propane tank and the room slide-out. The black and gray tanks are offset to the passenger side but I assume they were close to empty when the coach was weighed. I think a difference of 5% isn't worth worrying about.
John and Mary Knight
2015 Newmar Ventana 4311 - wheelchair accessible
2015 Cadillac SRX Luxury AWD
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