We did a lot of beach camping with the TT and the sand gets everywhere. Rule #1: NO grease, WD40, or other oily lubricants, they become sand magnets and once the sand sticks to the oil/grease, whatever you tried to lube will grind itself to death. I use a teflon "dry lube" spray on the jacks, steps, etc.
You can buy this at the major home centers and hardware stores:
Regarding the 7-way plug, I mounted one of these to the trailer tongue. It was an easy step to unplug from the truck and immediately store the plug here. It keeps the plug off the ground and protects it from water, sand, etc. This keeper is essentially a socket with no contacts. Insert the plug from the bottom, and the spring-loaded door engages the plug and keeps it from falling out, just like when you plug it into the truck.
On the truck camper, there is no place to mount the plug holder so I use one of these plug covers to keep the connector clean while the camper is off the truck. Click pics for links.
