Finally got around to getting a solar setup for my trailer, and now I wish I would've done it sooner!! Didn't even have to spend $200 on the entire setup, and it worked flawlessly over the 4th of July weekend. Here's what I did:
One Renogy 100 watt panel
Renogy 10 amp charge controller
10AWG 16 foot cables from the controller, to my batteries
Set of cables from the panel, to the charge controller
Kickstand for the panel to angle it up off the ground
That's it. Kept my batteries full all weekend, even with one of them dying on me. Super simple to setup, and all I had to was adjust the panel to face the sun every couple of hours. The panel is pretty sweet, and even charged during times of cloud cover.
My plan is to get two more panels and mount them on the roof of the trailer once it cools down. I'll also be able to mount my charge controller in a more permanent location at this time, as well. A higher amp charge controller is already on it's way for when I add the extra panels.
I'm still amazed at how well this all worked, for the little bit of money I have invested.