I would like to do the same thing. I've got a suitcase solar rig I've hooked up directly to my twin batteries.
This is who I copied it from, [ame]http://texasvanagons.com/review-renogy-100w-solar-panel-suitcase/[/ame], I would like to install a permanent solar panel on the roof to supplement the 100 watt suitcase rig. I also have a 50 quart ARB frig I've been using with great success. I've only parked it for about 3 days with no problems.