I carry a portable jump starter with me at all times.
1. It has started my MH 'several' times.:B
2. I also use it with a small inverter plugged into the 12v to run a small TV when boondocking. Lasts all night.
3. And to plug in a regular residential ac lamp if the power goes out.
4. And I have aired up a tire on the SUV with it.
5. Can't count all the times I have loaned it out at CG's to others to start their TV or MH!
6. I even had to use it sitting shot gun for the Brake Buddy control because the cig lighter position in the MH didn't allow it have a clean shot to the toad!!!
Charges up ac or dc. You can charge it back up with your coaches cig lighter but I prefer to plug it in the 110 at the shore station when parked at a CG.
IMHO, JMHO well worth having one on board.
_+inverter_