A very good friend of mine did this very thing to a 1990 Dodge Cummins ex cab longbed. He was moving to Kodiak, Ak and while driving to the ALCAN with a very heavy tandem axle haul mark, and while traveling about 70 mph, he hit one of those pesky frost heaves. It launched truck and trailer into the air. But with all that force, and the heavy trailer, it bent the truck frame in the same place just not as far. He continued to drive the truck after fixing a few minor things the remainder to Kodiak. Then used a large piece of I beam two chains and a hydraulic jack. This happens a lot on the ALCAN. Overloaded trailers, excessive speed and frost heaves or bad road conditions.
Garry