I have a 1993 Elkhorn 9. 5 ft hardside camper and I use the factory, POS, hitch with about a 12" extension to tow an enclosed, aluminum, tandem axle snowmobile trailer with a couple of ATV's in it, maybe 3500lbs. The factory hitch broke and was rewelded. I also added the MOPAR hitch repair brackets. Not good enough for a car trailer. Obviously you already figured out you need a more adequate hitch.
My camper weighs in at about 2,600 lbs loaded and with air bags and Rancho 9K shocks it handles well. Like anyone with a brain, I drive more conservative speeds with a load. I understand the point about the training wheels but I would much rather deal with 4 nice 19" commercial tires on decent rims. I just don't think the duallies are worth the effort if you don't need them all of the time and the 19's are nice. The dually trucks have the same axles in front and that is the best reason to keep the camper as light as you can anyway. You can get a bigger camper than a popup and be happy if you stay on the road, drive carefully, don't exceed the rating of the tires, tune the tire pressures, airbags, and shocks and have good trailer brakes.
If you get the torklift setup they have a nice attaching system for the rear of the camper. I am not so sure about the front setup, I think it could cause some major damage to the frame if it were struck on an obstacle. I would fabricate my own belly bar to hold down the front. JMO.