Sold my RV so I have a Voltage Regulator that will protect the circuit boards (like in your fridge at least $90.oo each) and can be chained to the power post so it cannot be easily taken. Also has a clear plastic cover so the weather cant get at it.
The second item is a set of 8 Lynx Levelers that are 1" high and set on each other so they dont slide. Even has a nylon carrying case.
Voltage Regular is $135.oo
Levelers are $35.oo for the set.