I just upgraded from a 98 2500 qc sb gas to a 2002 2500 qc sb diesel. I pull a 99 Jayco eagle 5vr 28ft. The original truck had a reese15k hitch. I will be installing the same hitch on the new truck. This hitch is the stationary model and the trailer has an extended box for clearance. Is there any advantage or disadvantage to the sliding hitch by reese for the short beds? Would I be better off w/slider? The dealer I purchased the trailer from said I was better off w/my current set-up. Any comments would be appreciated