We have a 25 ft. Dutchmen with a dry weight of 5000 lbs. and supposedly 450 lbs. on the tongue. As you will hear repeatedly the Dry weights really do not mean a thing.
The actual scale numbers when the TT is loaded for travel are; TT weight 6200 lbs. of which 700 lbs. is on the tongue. My TV payload is 1400 lbs. So with two adults, a dog and gear totaling 500 to 600 lbs. and a tongue weight of 700 lbs. we are at our limit.
We have had great success with our Blue Ox WD hitch; it has a stabilizing feature built in.