This crack is from the bottom corner of the bed pullout and mysteriously closes when on the jacks and opens when on the truck. The meticulous observation shows that contrary to the first observation, thisx not caused by a torsion movement but by a completely vertical movement of nearly 1/8 of an inch. After removing the bottom section I found nothing cracked on the frame, all the welds seem to be OK. While parked on the jacks, we repaired with two coats of fiberglass matt with resin and on the first few miles on the truck it cracked again.. Any suggestion anybody ?????????????
On the top the crack is closed ; on jacks
On the bottom the crack is open ; on the truck The grey is the primer , the top coat has been pulled by the temporary tape put on for traveling.