Had a 2005 Saturn. I made a fuse disconnect by shorting out the fuse, soldering leads to the test points on the blown fuse, and running a line into the cab with a pullable fuse. Could have used a switch, but this worked. If you have a hot line coming from the MH in the umbilical you could run a trickle charge to the toad battery and not bother with the fuse. I towed a few times on short trips, less than 2 hours, without pulling the fuse and never had a problem. If you don't pull the fuse and it gets dark outside the sensors will turn on the headlights and the battery will draw down rather quickly...don't ask me how I know. Happy Trails.