Running fridge while traveling off truck

I just leave mine on gas when I start it before my camping trips, even when plugged in... I'm in and out of the fridge a lot (it's where the beer is) and it stays colder on gas better than on electric when the door is opened a lot..

Yes, I know I can get an ice chest, but ice cost $$ too and I hate dealing with an ice chest when I've got a perfectly good fridge that is already cold... ;)

Just what works for me... :)

Mitch