I definitely re-torque after about 100 miles and yes, I have found noticeable changes in the torque values. I think, however, that the dual wheels on the truck are more prone to loosen than the aluminum wheels on the trailer. It may just be the higher torque requirement for the truck (140 ft-lbs) as opposed to the trailer.
As an aside, I waited until I had 1,500 miles on the truck - just after I bought it - before checking the torque on the wheel lugs. There wasn't a single wheel with the correct torque -and I remember, in particular, that the right front was downright loose. The mechanics at the GMC dealership I stopped at didn't have a clue about what the correct torque should be. They simply wanted to apply the air wrench they always used - since no one had ever asked them to check torque (---furthermore, they had no idea what the air wrench was set at!) My next stop was at NAPA to purchase a torque wrench, an extension to reach the dual lugs, the correct socket, and a breaker bar. I also carry an extra long star-type lug wrench, and ramps to roll the trailer up on to. The only thing I wish that I had, or that I could carry with me, is a set of four stands that would permit me to do a 7-tire rotation on the truck. I'll gladly pay a competent garage to work on my truck - but I'm finding that the word "competent" seems to be disappearing from the English language! Nowadays, I cringe when I have to take the truck in for service.
2003 GMC 3500 D/A, CC, LB, 4x4 and 2000 Airstream Excella 30. WBCCI 7074