I have those on the truck side. Makes hooking up the chains much easier.
If you wanted the most security bang for your buck, I still think a trailer wheel boot or a high end chain through the wheels and frame is the way to go.
I don't bother with either, but if I were concerned about it, a boot would be installed.
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"You can't buy happiness, but you can buy an RV. And that is pretty close."
Well, I will replace the hinge screws with security style ones that will only slow a casual opportunistic thief. This looks like a the same screw there now but has a built in center pin so that you can not insert the driver bit unless the driver bit but has a center hole. Not totally foolproof of course but will deter an opportunist roaming a campground. These security drivers are not sold at big box stores but exists.
Epoxy will work as well but you might need to remove the door one day.
Place a small flat-bladed screwdriver up against the center pin and give it a sharp rap. The center pin will snap off, allowing the use of a regular allen wrench to unscrew the defeated screw.