I have recently fitted air suspension to the back axle of my PVC. I had to remove the 4 "U" bolts to install the air bags. I have read that the "U" bolts should not be re-used as they are stretch bolts so re-using them is not recommended. Therefore I am sourcing replacements from Coastal Motorhomes.Does anyone know what torque setting these "U" bolts nuts should be tightened to?