On my trailer I have a outside box with a male plug
(the box has the flip close cover) then it goes to a
4 circuit breaker box then to the lights and wall
receptacles. 1 circuit is for the air conditioning
unit in the LQ... very simple set up. If I have power
at the track or home I just plug into the outlet,
if I need the generator(mounted in my truck) I pull
the 1 plug and plug in my gen
EDIT
I have it so the 110 comes from the outside box through
conduit then up through the floor to the breaker box.
I run the conduit so the animals dont eat the wiring
when its setting. Also I have to have a extension
cord for the track(I normally carry 2 heavy duty ones