Coach-man wrote:
If considering 2WD a limited slip rear is a must! The Diesel weighs a lot more than a gasser, putting more weight on the front axel, less on the rear, if you get into anything slippery the rear tires may start spinning. With limited slip having both rear wheels providing traction will help greatly, otherwise you could have a problem. Just my $0.02 worth, good luck with your truck and rig!
Limited Slip is a good option to have but since we are talking 5th wheels, the OP it probably throwing at least an extra 1500# on the rear axle (probably more like 2000-3000#), so there will be plenty of weight on the rear axle.