On the surface it looks like a nice combination.
Your truck will likely have ~1500 of available cargo capacity.
The floor plan you mention is a "couples" floor plan, not a family layout. Therefore I assume it will only be yourself and one other in truck...even if both of you are pretty big ~450lbs combined that still leaves 1050lbs payload for WD hitch, tongue weight and stuff.
It's doubtful you will ever load the Travel Trailer to GVWR, but it's very realistic you will add 1000lbs of gear and 300lbs of factory options, battery(ies) and propane bringing the loaded TT too 6550lbs.
Recommended tongue weight will be 13% which = 850lbs...call it 900 lbs of tongue weight once add the WD weight.
1500 cargo capacity - (450 passengers + 858 TW + 42 WD hitch) = 150 remaining for truck bed cargo (bikes, firewood, coolers, etc)
I drive a 2500 Duramax...but wouldn't hesitate to pull your proposed combination if my estimates are in the ballpark.