Street parked so running a leccy heater has never been an option for me.
My pump is on a wooden board with controller and inline filter all quick release along with van mounted reel and di.
I just isolate the tank and bring them in on a cold night but in 8 + years wfp my experience is I don't need to bother unless its gonna be atleast -2 overnight. Even then most the time I just isolate the tank disconnect all hoses and drain them by switching on the pump until it runs dry and thats been sufficient.
My 4040 is indoors though, so slightly different situation to others who have theirs in the van.