Captaincckhuck, Do you already have the 5th wheel? I may be in the minority, but to me it makes sense to get the trailer you want, then buy a truck that will tow it safely and comfortably. I bought my 1st 5th wheel and had it delivered to a campground by the dealer. Paid the delivery guy to stop at the scales so I would know the real (albeit empty) pin weight and total weight of my new trailer. Ended up with a short box F350 SRW for that trailer.
New trailer is significantly heavier that the 1st one so the new TV is a Ram 3500 DRW long box. Having had both a SRW short box and a DRW long box, I can say I'll never go back to a SRW or a short box. Just my $.02.
Central New York; 2016 Rockwood 2604WS travel trailer
2014 Ram 1500 Laramie Eco Diesel; 2002 Harley Heritage Classic