I wonder if the trailer may have flexed more than it normally would, having the weight supported where the blocks were as opposed to where the suspension attaches?
Maybe a combination of that, and the vinyl getting less elastic/flexible with age?
Dodge Ram dually laramie 4x4 w/jake, B&W, Brakesmart.
Kit Patio Hauler 394F toyhauler 5th wheel
Camo 680 Rincon, Green 500 Foreman, Blk twincam Roadking