I have a 2001 GMC 2500HD 4X4 LB7 with the 6 speed manual trans that my back tires started to separate on our last trip with our 32ft 5th wheel toy hauler (Forest River Sandstorm). The tires are Hercules All Track A/T Load Range E tires. I rotate every oil change and have good even wear and all ways add air up to max 80psi when pulling the trailer and deflate back to 45psi unloaded. I have never had this issue before, any suggestion why, I'm thinking I need to put air bags on the truck to get more weight transferring back on to the trailer. We only have had the Sandstorm for a year and the tires for around 2 (our first RV), any thoughts?

 

make sure your tires pressure isnt over inflated,usually the cause of seperation.. use the tire pressure specs on the side door of the truck, how many kilometers on the tires? there life span is around 80ks..just keep in that in mind.

 

I checked the specs on the door and 80psi for the rear.