APT wrote:
Expect loaded/ready to travel hitch weight to increase by 150-250 pounds for a TT.
that's a very minimum. depending on configuration, add 1 or 2 batteries (60-120lbs) and between 30 and 60 lbs for propane. Then the stuff you put in the trailer.
In our case our 795lb empty tongue weight, verified with a sherline scale climbs to 1250lbs with the trailer loaded and no water or 1450lbs with a full fresh and empty black/grey tanks. Empty fresh and full black/grey pushs it even higher. I'd recomend expecting tongue weight to increase 50-100%.
Or, assume that the loaded tongue weight will be around 15% of the GVWR, even if you don't load it to GVWR and form your decision around WD hitch, reciever, tow vehicle around that number.
and correct, most mfg spec tongue weight with propane tanks installed but empty and no batteries. Unfortunetly, propane and batteries add a reasonable amount of weight and are located close enough to the ball that virtually all the added weight transfers to the tongue.
I've helped quite a few folks set up hitches and I've yet to come across a case where someone overestimated their tongue weight.