Raising a trailer with torsion ride is not a problem. I had a frame shop raise our camper to be able to put 16" tires under it. A good shop can make the spacers, side plates, align and mount the axles. This was done on a 10800# travel trailer and after some hitch adjustments she tows great with the XPS ribs on both truck and trailer.
Before photo of the frame and axle.

After photo using thich walled square tubing and heavy side plates.

Best modification I have done to the camper. No stinking ST tires to blow out any more.
Rolling with new lift job.
