rtz549 wrote:
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So an RV maker buys one of these:
The sticker on it says pump them up to 70psi. They get done building it and now it weighs 30,000 lbs or more. Your driving across death valley and you've got 60 psi in your tires. Same story. Should have had 90 psi or more in them.
Semi Trucks don't mess around with trying to run the least amount of air for a smooth ride. If the tire will take 110 psi; that's what's in it.
I think the entire RV industry as a whole would have far fewer blowouts and tire issues if all tires were set at max PSI. Safety margin, less flexing at speed. If you read the fine print in the pdfs for semi truck tires; there is a statement that says something to the extent of if you will be running at speed at max load; run an extra 10psi in the tire.
You apparently do not understand the process by which the tire pressures are determined for a vehicle that is built as a chassis with the body added by a secondary Manufacturer.
The chassis builder
DOES NOT GENERATE ANY TIRE PRESSURE DATAThe finished vehicle is certified by the final stage Manufacturer (in our case, the RV builder) and it is he who determines the required tire pressures to support the final vehicle axle ratings and HE produces the Certification label with weights and the label with tire pressures on it.
As to your argument about setting tires to max pressure regardless, talk to some tire experts about center tread wear, reduced braking capacity, reduced water displacement on top of the harsher ride.
