Do these fit?.. Also, I have the relay for a second battery, have never installed it.. what else will I need to actually add a second battery? 

I've been wanting to do this for a long time.. was always too broke to even buy a second battery.. but things are a little better right now... for the mean time... 

Plus can anyone recommend anything on solar panels... like where would I install it on the vangon.... seems like maybe the best place would be just as if you were installing a sunroof... only it wouldn't be a glass sunroof, but a solar panel instead... wouldn't have to open mind you... (though it could.... )... you could even have solar panel vents installed on the solar panel itself (to help hot humid air exit the parked vanagon... ) if this won't damage the solar panel (will it???)...