I just bought a 2015 F-250 diesel 6.7 with very low miles. I will not consider buying a bigger horse but will consider mods to increase the towing capacity a wee bit. I don't have a hitch as yet.
(snip)
I am looking at two 5th wheels.
.....Length UVW GVWR F Water Dry Hitch
1. 36'11" 10520 12200 48 gal 1880
2. 38'1" 10372 12465 60 gal 1990
The truck won't have any problems towing either of those trailers.
Your trucks specs you posted doesn't seem correct for a 5th wheel trailer.
Looking at Fleet Ford spec website shows a F250 6.7 diesel has a 3.31 or 3.55 gears has a 16k lb tow rating for a Gn or 5th wheel trailer.
GCWR is 23500 Lbs.
The F350 DRW gets the 3.73 gears.
Also the 12100 lb trailer weight is for a bumper pull.
ford towing specs
I wouldn't add any thing to a trucks suspension till you load it up and make a short drive down the road. Then is the tie to make that decision.
