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04-04-2013, 10:11 AM
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#1
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Senior Member
Join Date: May 2012
Posts: 3,816
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Weight
While we were at Newmar in Nappanee I had Newmar do a 4 corner weigh of our coach. If you go there for service work it's worth your time to ask.
The coach was fully loaded, with a full tank of fresh water and just over 3/4 tank of Diesel. Black and grey were emptied morning before it was weighed. 3/4 tank of DEF.
Here is how ours weighed out.
LF 7390 lb
RF 7570 lb
LR 8055 lb
RR 8580 lb
LR2 4105 lb
TAG AXLE
RR2 3515 lb
Total 39215 lb
This does not include our Jeep Grand Cherokee which weighs 4800 lb. Or us and the cat.
It was interesting to see the right side heavier all the way down. On ours I can't really shift anything around.
Our tires are Michelin 315/80R22.5 and I've been running the fronts at 120 psi with all 6 rears at 85.
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2011 MVP Tahoe 230 QB on Ford E350 Chassis
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04-04-2013, 10:41 AM
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#2
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Administrator in Memoriam
Newmar Owners Club Retired Fire Service RVer's Spartan Chassis
Join Date: May 2000
Location: Newark, DE
Posts: 25,898
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That's not a bad side to side imbalance.
That may be evened out somewhat by making ride height adjustments,but I think it's within Spartan's recommendation. I can't recall if the imbalance should be within 5% or 10% of the axle's rating.
It has to be done at the scale, and it's not a science. A lot of trial and error is involved and sometimes little can be done.
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Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, previously 4 years as a fulltimer in a '07 DSDP
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04-04-2013, 10:53 AM
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#3
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Senior Member
Join Date: May 2012
Posts: 3,816
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Interesting, I'll have to look into it a bit more.
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2011 MVP Tahoe 230 QB on Ford E350 Chassis
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04-04-2013, 04:32 PM
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#4
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Senior Member
Join Date: Jan 2011
Posts: 523
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Almost 15,000 on the front. That is pretty heavy!
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04-04-2013, 04:51 PM
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#5
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Senior Member
Join Date: May 2012
Posts: 3,816
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Our front is rated at 17,000 lbs. Newmar stepped it up on their front axle. I don't think I can over load this one.
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2011 MVP Tahoe 230 QB on Ford E350 Chassis
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04-04-2013, 06:31 PM
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#6
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Senior Member
Join Date: Jan 2011
Posts: 523
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Wow, at 17,000, you never will!
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04-04-2013, 06:42 PM
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#7
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Member
Join Date: Oct 2012
Posts: 37
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Quote:
Originally Posted by PDR John
Our tires are Michelin 315/80R22.5 and I've been running the fronts at 120 psi with all 6 rears at 85.
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Data for (315/80R22.5) 7390 to 7570 lbs load, the tire table indicates 100 lbs not 120 lbs for the front. I'm I reading the Michelin Tire Chart correctly ? Is there a certain factor I need to add ?
In this case, is it my understanding to use the 85 lb. rating for any loads less than what is available on the chart table for the rear.
Michelin North America RV Load & Inflation Tables
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04-04-2013, 07:08 PM
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#8
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Senior Member
Newmar Owners Club
Join Date: Jun 2010
Location: New Brunswick CANADA
Posts: 688
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120 PSI in the front tires seems a whole lot of air and stiffness on the rroad for me (Michelin reference....)
Good exercise for a heavy coach 
__________________
2006 Dutch Star DP 400 ISL-AutoMotion Shades
Spartan Chassis
Norcold out (1 more)
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04-04-2013, 07:36 PM
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#9
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Senior Member
Join Date: May 2012
Posts: 3,816
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Quote:
Originally Posted by Vlady Daddy
Data for (315/80R22.5) 7390 to 7570 lbs load, the tire table indicates 100 lbs not 120 lbs for the front. I'm I reading the Michelin Tire Chart correctly ? Is there a certain factor I need to add ?
In this case, is it my understanding to use the 85 lb. rating for any loads less than what is available on the chart table for the rear.
Michelin North America RV Load & Inflation Tables |
Quote:
Originally Posted by Renden
120 PSI in the front tires seems a whole lot of air and stiffness on the rroad for me (Michelin reference....)
Good exercise for a heavy coach |
I believe your both correct. When I picked that psi was from using a Cat scale and trying to factor in side to side variance.
Part of the reason I made this post was to show the information difference between an axle scale vs wheel scale.
I think I'm going to try 110, because this weight didn't include 37.5 gallons of diesel and the 2 of us.
When we took possession the factory had 130 in the fronts.
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2011 MVP Tahoe 230 QB on Ford E350 Chassis
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