Tyler:
You know your stuff! After I posted, I realized, "wait! this thing's under extended warranty! I can just call the dealer"...
Service writer can't be certain, especially sight unseen....but said something like, "years ago, in the previous series of 1500's, we had this issue...traced it back to the drive shaft being shifted to a weird angle when the vehicle is heavily loaded"...apparently their (then) solution was some sort of lifting block, that solved the problem when under load but created the situaation of rumbling when the trucks would be empty
I set my Reese at 5 links....might the truck 'perceive' the load differently if I put more tension on the w/d hitch, to level it up tighter than I usually run it? that would seem to be a solution, if it's truly a 'driveshaft angle under load' issue...most times, the weight on/in the truck is the trailer tongue weight rather than a cab full of people or a bed full of heavy cargo
Thanks in advance for any further input
