My feeling is that after over 18 months of researching, some of the info makes it seem harder than it really is. I like the Renogy 200 or 400 watt starter kits that have everything you need. The biggest issue for me was how to get the cable from the panels to the controller. The refrigerator vent was at the opposite end of the trailer so I didn't care for that solution as it involved too much cable and voltage drop. I finally found a good description (somewhere) of using a holding tank vent and that took care of my biggest problem. There are lots of solar panel install threads so just find one you like that answers most of your questions.
A DIY Solar InstallPeople agonize over how much solar, whether to use PWM or MPPT controllers, what size cable, parallel or series wiring. You can just start simple and change later. I went with two 100w panels and a 30a PWM controller that can support two more panels.