If you're going full time then absolutely the long bed. You get almost 4' of space between the cab and 5th hitch. A good place for a large aluminum box to store stuff in. Plus still have some extra room between it and the hitch. I have a LB and wouldn't want it any other way. No messing with sliders. Can't compare the ride between an SB and LB while towing but I did test drive an SB and LB before I bought my LB. Didn't notice any difference. You'll want a DRW anyway for that big of a 5th if you're full timing. I'm guessing you'll have it loaded to the gills and you'll need the payload capacity the DRW has.
