[dadofthree]

Thanks for the comments. I do plan on getting E rated tires and most likely air bags, regardless of TT or 5'er. I do have one other concern in addition to exceeding GVWR, and that is there enough distance between the rear axles and the back of the cab on a CrewMax to even attempt turning with a 5'er. I'll search this sight for 5th wheel related info as suggested, but if anyone has experience with a 5'er and a CrewMax, I'd love to hear about it.