If you want a mobile system I would just build a small, independent one. Two panels with a basic 30-amp charge controller, two batteries and a smaller 1200 watt inverter only runs about $650. I plan to do this on my RV at some point in the future. (Four batteries are just too heavy and bulky to lug around.)
Thanks Edheler. Solar work on RV (or small camper) is especially interesting for me, so yes, looking forward to that.