To the OP, I think you have pretty much answered your own question. The truck you have will not carry the load within it's stated limits.
As you probably already know, when we have living qtrs in these trailers, we tend to get front heavy anyway. We take a lot of stuff for a show. Nobody goes to a show "packing light".
Bottom line is: my F350 dually has enough extra capacity, that when I'm loaded for a show ( Kiefer Built 4 horse slant with front dressing room, moderately modded for "living" ), I am within all the limits stated by Ford. "If" this were a F350 SRW, I would be over some of the ratings.
Honestly, if you're gonna get really carried away with a higher end living qtr trailer, like with slide out and all the goodies you may want to look at a F450, or a MDT from Freightliner.
Do your homework, and figure most of the time with these horse haulers, we are often bumping right up against the GVWR of the trailer. Figure 22-25% on the pin.
The difference between RV trailers, and horse trailers, is that typically, with a camper, folks "only" add maybe 1200 to 2000 pounds on top of the so called as shipped weight.
WTH....we can add that much in a horse trailer with just one horse. Then we add the other horses, and all the tack and a couple or three riders in the backseat, etc.
