I just picked up an XLR 321 that I am towing with a 2002 Chev. 2500HD Duramax. I did about 1,000 miles this weekend and this is my accessment:
Truck: 7500# Airlift bags at 60#, oversized transmission pan, Anderson 20,000# rail hitch, Bullydog tuner set at 2 (tow/haul), Michelin 265x75x16 tires that upgrade from factory 3,000 to 3400# each.
My trip was interstate and secondary roads. I traveled around 60 to 70 MPH on the open road. The elevation varied from 3,300 ft. to 7,800 ft. Temperatures ranged from 39 degrees to 78 degrees and there were times when there was a pretty good crosswind that was noticeable in handling, however I never felt out of control.
I never saw trans. temperatures above 210 degrees nor engine temps above 210. EGT temps were not above 1,200 degrees except on a few brief occasions where they would go to 1,300 on a hard pull.
I did not weigh the rig, but I am assuming that I was probably a little overloaded, however, the truck handled everything just about the same as when I was pulling my 1996 32" Holiday Rambler.
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