As I see it, there is no need to max the tire pressures on the trailer if you are not carrying the max load. If you are not carrying water in the fresh, gray, black tanks and are not fully stocked for a long trip then why do it. I run 58 lbs on my '77 Excella 50 because I am no where maxed out. Of course, you should head to the truck scales to find out just what your loaded trailer weighs and fill your tires accordingly. My 2500hd with E rated Steeltex tires runs 70 lbs. in the rear for towing rather than the 80 for the maximum. I ran 65 lbs. one time and it seemed a little mushy in the rear. Tongue weight is a little over 1,000 lbs.
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system