What i did was run a hot and ground wire from my Pickup battery to the back of my pickup. Drilled two holes inside the liscence plate spot and put two bolts with wing nuts on them. Then i just hook my starter straight to 12V works great. Don't think it would crank big gassers but that is the starter itself not being big enough. But will turn a 180 quite well. Where we fly most times my planes are at the back of my truck anyway and if not then I use the panel from my flight box. With using the pickup though I don't even take my field box as i have everything in a bag and small plastic boxes. Most field boxes don't work very well IMO. The drawers fall out or won't close easily. Hard to get to battery also.

Oh use pretty heavy guage wire or you lose power running it that far. But then your battery is always hot. And your truck or car will recharge any time you go anywhere so unless it goes bad you always have a hot battery.