Metricnut, my '51 half ton seemed to sag on one side so I took it to a spring shop, thinking I could have the springs re-arced. They found what they thought was a bent frame causing the problem. I don't know where in AZ you are located but the spring shop recommended Gilbert Collision (in Gilbert, AZ, of course). I took the truck there and they pulled the bed, put the truck on their hydraulic frame staightener. Now, the truck sits nice and pretty. They thought the truck had been hit on the right side in the past, probably prompting the restoration it had 15-17 years ago by a PO. I recall I paid $350-400 dollars but I thought it was well worth it for such a serious ailment.
