These camper mounts look solid and well tailored. Chrome and/or stainless steel should last for years. The threaded section at the bottom of each cylinder is about 1 inch long, not just a nut welded to it. Some lube like silicone spray can extend the lifespan. Turn the cylinders just enough for the knobs to push the latch all the way down, but not so much that you end up bending the knobs! I recommend not screwing the knobs in, but leaving one or two in the door pocket and the rest in the tool box. In use, you may find that the handle needs to be flipped to fully unbind. This will likely vary by RV and truck system. I added a piece of heavy chain with a hook at the bottom for each front attachment. As for the rear, I found the Happijac thread part to be too long in my setup. I just cut off a few inches so it screws a few inches into the cylinder. Be sure to file the cut end around the entire perimeter. Before cutting, it is better to put one of the lock nuts on it. This then results in a clean stream. Each time you load, you may need to make a few turns on the cylinders to lock them before locking the handles. Tie the small pin rings to the clasp with something like a long piece of quality tie to keep them from getting lost. For safety reasons, they must be installed while driving. If you have trouble inserting the pins, simply insert the handle and wiggle the latch a little. Enjoy. These fasteners make loading and unloading much easier for you. Don't forget to unplug the power cord. Ha!
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