As for your hitch, it will POP sometimes and personally when it rained, I had a friction sway bar that would growl at me when it was wet.
That first time those chains pop, you are going to think you just lost your trailer.
If your plugged into shore power, you won't run anything down using it. The radio will run down about the same rate as the one in your car if not plugged in. So a few hours of use, isn't going to hurt anything if not plugged in.
2015 32 Foot Rockwood 8289WS 5th Wheel
2013 Chevy 3/4 Ton TV