I ended up just siliconing the controller to the under side of the battery cover. If the acid eats it up, I'll move it. Cheap controller anyway. I then wired the other end to a bulkhead connector on the battery cover. Put 25 ft of wire on the back of the panel with a connector for the bulkhead fitting. If were dry camping, I'll take the panel, set it up and plug it in. Rain of shine, should do the trick. Don't use the furnace when we are dry camping so it's just to top off the batteries for the water pump, lights and maybe a movie.
Thanks for all the tips!
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