Re: 5th wheel
some people seem to think that all 5th wheels are ginormous.
i have seen some with a total length maybe a bit over 20 ft. i would guess they weigh in the neighborhood of 3-4 thousand pounds.
i would think that this would be doable. probably want a 4.0 to pull it with though and if it's an auto, definitely a good sized aftermarket tranny cooler.