While parked at one truck stop I watched as one RV got weighed on the truck scale. Apparently the owner talked the scale operator into weighing the four corners.
As he put first the front and then the rear wheel on the scale, the coach was LEANING way to the passenger side. Then he turned the coach around and backed up on to the scales, this time LEANING way to the driver's side.
The ONLY way to get an accurate corner weight is for the coach to remain perfectly level while on the scales. Any lean by the RV away from the scale will make the weight given useless.
If the owner of the RV I watched then adjusted his air pressure to the scale weight he was given, he drove off with all four tires severely underinflated.