I used to have a 2 wheel drive Chevy dually that sat lower than the 4 wheel drives.
My camper is built very much like a Lance with a rear bumper that’s below the camper floor.
What I did was instead of stretching the tongue in a straight line, I cut it off and welded the extra C-channel stretch section below the original trailer frame. Then I put the hitch coupler above that at the front. That way it laid low and gave extra clearance for the camper above the trailer.
I also tossed a sheet of 2” thick rigid foam insulation under that camper to buy a little room.
I ran that thousands of miles.
If you stretch a trailer tongue, put triangle gussets in all the corners and add a crossmember or two so it doesn’t twist and it’ll be totally solid.
I have a heavy trailer. For the record, I do believe that lightweight (say 7000 or less) trailers on short extensions (maybe 18” or so) are just fine. It’s just the four-footers with substantial trailers that I think aren’t good engineering.
Plus there’s all that extra heavy junk to install every time you load and unload the camper.
