These are available at Canadian Tire up here and it is possible to connect an external battery.
Originally Posted by eleblanc
If your needs exceed this than 2 X 6 volt golf cart batteries and an external charger/1kilowatt inverter is the way to go.
1970 Mercedes Unimog
2004 F150 Heritage Supercab
1974 Holiday 17' Travel Trailer
It's not about the truck and it is not about the distance traveled. Get out there with whatever you have, meet people and see things. Push the envelope of your comfort zone and live.