One possible way to drop a camper on the ground in a few seconds: if the turnbuckle pattern is a parallelogram instead of a trapezoid. A backward leaning parallelogram of four hook:hook turnbuckles will drop all four turnbuckles if the camper shifts forward and the next bumpy hill will drop the camper on the ground in a few seconds. I have four safety chains plus the hook:hook turnbuckles plus blocking to keep the camper from moving side-to-side. Some folks have posted the idea of a backward leaning parallelogram turnbuckle pattern to "keep the camper on".
Even truck bed tie-downs installed to create a trapezoid can have a backward leaning parallelogram turnbuckle pattern if the camper is positioned too far back in the bed when the turnbuckles are attached.
Also, if a parallelogram turnbuckle pattern leans toward the driver's side because the camper was loaded too far off center then a camper movement toward the passenger side would quickly drop all four turnbuckles.
Edited by iowahiker, 22 January 2019 - 04:29 PM.