The thing is, I've noticed that the better portion of brand new, lifted, single-rear-wheel, 3500, diesel pickups belong to people who never actually use it as a truck... Odds are they never actually use it to offroad either, except for that one time they see a deep puddle of mud and think that "hey, I have a big truck with 4 wheel drive" and the next thing you know your hooking their truck to the other end of your tow strap and showing them that the rust and dents don't stop you from blowin some smoke, layin some tracks, and getting their butt out of a sticky situation. I speak from experience.
Anyway, I agree with PT, those Rockstars look like theyd buckle under a real truck with a real load.
On the other hand, I would imagine that anything with the 8 bolt pattern can most likely at least hold the weight of the truck, if your not ever gonna really throw too much in the bed ever. I wouldn't go driving over any curbs though.
Thats kinda what I was getting at with the 16. 5" vs 16" rims. I wouldn't run these trucks with anything less than an E rated tire. C's are just about enough to hold the truck... just don't fill the gas tank more than half... or even sit in it. Yeah, E's can be found for 16" pretty commonly, but watch what you tell the tire guys, they don't know anything. They always fill my brand new tires to 45psi front and 60psi rear. A 16. 5" would most likely remedy any confusion, because I'm guessing they don't make any lower than E rated tires for 16. 5" rims.