Originally Posted by FAY

Yes, 25 psi seems like too little pressure in the rear tires. My 2005 3500 SRW with LT 265/70R 17E Michellin tires requires a minimum of 40 psi in the rear and 50 psi in front when the truck is empty and 75 psi in the rear and 60 psi in front when it is loaded. If I recall correctly the tire sidewall states that 80 psi is the maximum limit in the rear tires. I hauled a long bed piled up high load of wet clay that almost bottomed out the overload springs with 80 psi in the rear tires and 60 psi in the front tires. My truck was overloaded and I traveled about 25 miles at around 55 mph on the freeway straight-a-way, but I slowed down to about 45 mph for curves as the truck felt a little unstable without dual wheels. All went well, but it was a chore shoveling the clay into the box and out again. I had help loading the truck, but not unloading.