Difficulty Reducing Tongue Weight

Is there any way you could try towing the trailer with a heavier truck, like a 2500 or an F250, or even a dually? See if you experience the same things. My first guess is, the truck itself is just too light. It may tow the weight, it may also be within specs for load capacity, but the actual weight of the entire truck is just too light, trailer too long, and trailer too heavy. The weight, design, and length of the trailer just overpowers the truck, causing very uneasy feelings when driving. If you can borrower someone else's truck for a short while, go for a drive, see what you think. If you still experience the uneasiness in the heftier truck, then something is wrong with the camper itself. That's the approach I'd start with. Good luck.