If you use axle weights rather than actual corner weights, be sure to round up about 500 lbs before dividing by two (or 4 for the rear) to get an estimate of the load on each wheel. That will allow for side-to-side imbalance.

Another technique that works is to use the actual axle weight divided by 2 (front) or 4 (rear) and then move up one weight class in the tire table from that. Going up one tire weight class is equivalent to using an increased tire weight value, i.e. it allows for a greater load on the tire.

As a former OTR trucker running 48 states I had to find scales all over the US. Moving companies will always know where the nearest scale is and some have their own scales. As mentioned in other posts, grain elevators, sand & gravel companies, and larger towns often have public scales which may be in the yellow pages. If you go to Red Bay you can weigh at the dog food plant. Many companies that buy or sell products based on weight will have scales. Scales are not always easy to find but they are out there. If you are nice and polite they may let you do all four corners - not all can or will.

A note on the four corner thing. I see by a couple of posts that not everyone understands the concept. You do not inflate your tires based on the max pressure on the manufacturer's sticker. All tire companies have charts showing inflation pressures based on weight. Say you weigh your fronts and right is 5,000 with left at 7,000 - you need to inflate both front tires to the pressure required at 7,000 - most important is that tires on an axle be at the same pressure. Most tire manuals will explain the procedure. If you do not have the manual most companies have them online or you can call a dealer. If I weighed and saw a 2,000 difference between right and left I would try to find a way to get the weight closer to even by shifting things around. It is best to try to be even or balanced from side to side. Front engine motorhomes will probably have more weight in front while rear engines will be heavier in back. If you find you are overweight you might be able to reduce you weight by running with all water tanks empty or at least low. Keep in mind that every pound of weight means a longer stopping distance in an emergency - try to stay light.

I bought a used, 20,000 capacity, General Electrodynamics MD400 Wheel Load weight scale for $175 on Ebay (including shipping for 46 the pounds it weighs). I drive each wheel up on it and record the weight and balance my coach while on the road (the scale stays in the coach). Here is the Manufacturer's site information link: http://www.gecscales.com/t-md400.htm

I have seen these go for as much as $700 each used down to what I got mine for. Military surplus sites also offer them. I haven't had mine calibrated but it is right there with Flying J scale numbers when I combine both my wheel results. At $15 each time to weigh the coach (not knowing how the weight is distributed on each axle), this scale has paid for itself times over.

Happy travels,
sparetire