OP,
If I was a betting man (which I'm not), am willing to bet the GVW on the era of 6.0 PSD is 8800 and truck itself will eat up most of that. So if you added in the weight of the 5er, you'd be over the GVW of the truck. Shoot, even the 350's then only had 9900 GVW. Ford's newest 250's are rated at 10,000 GVW and truck should weigh around 8000-8600 by itself. 350's are at 11,5000 GVW with pretty much same static weight as the 250's. To answer your questions, IMO, no, a 250 is not suited for what your looking at unless you want to be overweight (I know this personally, cuz we were there). Yes many 3/4 tons pulling large and too large of RV's. They can pull them, but stopping and being involved in a accident will w/o a doubt involve some sue happy att'y and see that the owner was overweight. I'd even go as far as saying that some 1 tons SRW fall into same category. Had a '15 350 and it handled RV we had at that time w/ ease. Then upgraded RV and it pretty much was overweight on everything on the '15. Stunk cuz I really liked the'15. Ended up w/ the '17 DRW 350 and agree 100% w/ others as to how it tows/handles. Even the Mrs likes towing w/ it better. Yes the DRW stinks (IMO) in snow, but just have to adjust. Otherwise, overall very content w/ the DRW. If I had the dough, I'd have a SRW for everyday/winter use (mainly to tow snowmobile trailer), or a smaller p/u. But seeing I didn't win the lottery or much on scratch off's, the DRW will have to do.
NY