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Old 09-01-2016, 03:51 PM   #1
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Quick question on uvw

Thought i had this figured out but i want to make sure. On our Itasca, the MH Weight Info label states,,

"Unloaded Vehicle Weight is the weight of the motor home as manufactured at the factory with full fuel, engine oil, and coolants."

Sounds easy but i've also read that some manufacturers include factory installed options in the uvw. On ours, the label shows a separate weight for factory installed options. Is it safe to assume the weight of these options (hydraulic jacks is one) need to be added to the existing uvw number to get the true uvw?

I know, i know, i should go have the thing weighed but until then... Thanks!
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Old 09-01-2016, 04:31 PM   #2
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I recommend running all tires at max pressure indicated on sidewall until you weigh your MH. As you already know, getting a 4 corner weighing is the only way to remove all guessing. Tire pressures can then be adjusted using tire weight charts. Accurate weighing can reveal unsafe conditions.
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Old 09-01-2016, 04:40 PM   #3
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Quote:
Originally Posted by gruelens View Post
I recommend running all tires at max pressure indicated on sidewall until you weigh your MH. As you already know, getting a 4 corner weighing is the only way to remove all guessing. Tire pressures can then be adjusted using tire weight charts. Accurate weighing can reveal unsafe conditions.
The pressure on the sidewall of a Michelin RV truck size tire and many others is not the "Maximum" the tire should ever have (unlike car tires) it is the minimum to support the maximum rated carrying capacity of the tire. NHTSA defines a truck tire as those used on anything with a GVWR of 10,000#'s or more.

From the Michelin RV Tire Guide:
Quote:
"If you look at the tire's sidewall, you'll see the maximum load capacity allowed for the size tire and load rating, and the minimum cold air inflation needed to carry the maximum load."
From page 6 of the GoodYear RV Tire and Care Guide:
Quote:
"How much air is enough?
The proper air inflation for your tires depends on how much your fully loaded RV or trailer weighs. Look at the sidewall of your RV tire and you’ll see the maximum load capacity for the tire size and load rating, as well as the minimum cold air inflation, needed to carry that maximum load."
From TOYO:
Quote:
Q: What are the consequences of inflating the tires to accommodate the actual loads?
A: If the inflation pressure corresponds to the actual tire load according to the tire manufacturer’s load and pressure table, the tire will be running at 100% of its rated load at that pressure. This practice may not provide sufficient safety margin. Any air pressure loss below the minimum required to carry the load can result in eventual tire failure.
But then they go ahead and publish a weight/pressure chart allowing lower pressure for RV's!!

From the August 2010 Motorhome Magazine "Tread Carefully" tire article:
Quote:
The maximum load capacity allowed for the size tire and load rating and the minimum cold air inflation needed to carry that maximum load are located on the tire’s sidewall.
From our owners manual:
Quote:
Federal law requires that the tire’s maximum load rating be molded into the sidewall of the tire.
If you look there, you will see the maximum load allowed and the cold air inflation pressure required to carry that stated maximum load. Less air pressure restricts the tire to carry a lighter load.
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Old 09-01-2016, 04:40 PM   #4
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The key there is "as manufactured at the factory". Pretty sure the options you have were installed at the factory. Ours has a sticker in the closet that lists all the weights of the options and what you have left for your stuff. Max air in the tires will make for a nice hard ride, if you like that kind of stuff. You should have a sticker somewhere, mine is on driver's door, that states max front and rear axle weights. Use that to set your tire pressure until or if you get it weighed.
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Old 09-01-2016, 08:49 PM   #5
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The way i'm going about it now is to leave the GVWR as is but then round the UVW and factory installed options weights up to the next hundred. Adding in the full water tank, propane, and us humans,, we still show close to 800lbs for supplies. I know this can add up quick but since we don't full time, we don't carry a bunch of junk for our normally long weekend trips.

Weighing the rig would definitely be more precise but for now, i'm not worried about being overweight. I was just curious to see if factory installed options were included in the UVW on the label. I don't think they are but if they were, that would make our rig almost 500 lbs lighter than what i'm calculating now.

Oh, been driving it for 13 years with not one problem on load range F tires. Maximum pressure is a no go. Experimented with pressures and found that 80 psi more than satisfies load requirements and also gives a decent ride.
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