Originally Posted by taken
This is what I've been doing. I second guessed myself after reading JIMNLIN's answer so I called Goodyear direct. I have the G614's that I run at 95-100 psi based on the load inflation chart and my 7k axles. Goodyear confirmed that you always go by the load inflation chart and not go with max sidewall listed pressure. I did mention what Jim posted about their RV guide saying that but they told me to go the other way. I guess it's dealer's choice since they post the info both ways...
I've mentioned it to the 1-800 folks and they had no idea that it was there on their website nor did they understand about inner ply shear/side scrubbing issues and close spaced axles/tires on trailers. After all their in the business to sell you a tire.
However experienced trailer owners and RV tire blogs recommend max pressures in tires on a conventional trailer with axle in the center. Now a interstate trailer type with tires at the corners don't side scrub so a minimum pressure works for them.
More reading on the subject from the pros;
Step 5 - Tire Loads | RV Tire Inflation Procedures
. 5th wheel street at one time did recommend a minimum pressure chart for trailers but woke up and no longer recommend doing so.
and from a actual tire engineer;
RV Tire Safety: Inflation
. Scroll down about 2/3rds to the bottom and see his info on interply shear forces on a trailer.
Never heard of derating a tire on a trailer till I started hanging out on RV websites.