Master lock makes a pin type lock that I picked up at Walmart. Do not ever tow without something in that little hole to secure the latch.
There are plastic ones and metal ones. Walmart again has those although they may not have the metal ones. A trailer supply store like Camping World will have them or look on line at a site like Etrailer.
It is said to not attach the breakaway switch cable to the hitch itself as the hitch could possibly fall off of the vehicle in a failure situation. That said there is no good spot on my truck to hook it to other than a hole on the receiver on the truck. That's where I hook mine. I put a carabiner through the loop on the cable and I use that to attach it.
Drain the tank is all I do for storing between trips. Chlorine is your friend in this situation. I sanitize my fresh tank in the spring and then I don't worry about it any more other than draining it. Same with the water heater. drain it. Just don't forget to refill it before you try to use it again.
