I see you have discovered the legendary RL flexible chassis. If you look at the floor members in the loadspace they are all spaced a few mm apart, not because they have shrunk but because they were built like that to let the body flex.
When in storage for the AFS, they all had wooden blocks fitted to take the weight off the springs, the regulators were removed and a device was fitted to hold the clutches down as they are prone to sticking.
When we picked our ones up we discovered that even the fuel tanks were inhibited and they smoked like mad until we filled the tanks with fresh fuel.