New to RV'ing

I use a 75W solar panel to keep the batteries charged while dry camping. I cut a short extension cord in half and wired one half to the panel wires and the other half going into the controller. Coming out of the controller I wired a 7 pin receptacle just like what's on the back of the truck. Thus, I can plug the trailer's pigtail into it. I set the panel on the ground, sometimes propped up on a rock or anything handy. If I need more wire to get into a sunny patch, I add a standard 25' or 50' extension cord between the panel and controller. Very easy when you have those standard plugs in the line.

If you just want to run a fan, LED lights, and the occasional burst of the water pump and whatnot, the two 6V batts and a 100W panel should keep you going for several days (unless you just don't get any sunshine at all).