Welcome to the forum.
I just went out and measured my truck bed height because I was curious as to just how lifted your truck is. My truck has stock suspension but with 4WD is tall for a stock truck. Add to that the oversize tires and I'm a couple inches taller than a completely stock truck of my year - and I'm at 34" bed height, over two feet shorter than your truck.
I presume your trailer is a fifth wheel, the reason you mention bed height (if you were talking about a tow behind I imagine you'd be asking about hitch height). If you do have a pull behind, you can use a drop hitch, although you are talking about a significant drop so the hitch will likely have to be custom fabricated. If your Champion is a fifth wheel, I'll go so far as to say it can't be towed behind a substantially lifted truck such as yours. Apart from the safety issues mentioned by others, there would be the sheer height of the trailer if you lifted it enough to tow. While a 90s fifth wheel isn't as tall as a newer one, raising one two feet is likely to create overheight issues.