Typically I have found the second vehicle charge is because someone has to drive it to the park. Therefore more people occupying the site. I have not yet heard or seen firsthand any park charge additional fees for a cargoed vehicle that could be parked on your site. The problem I see is finding a site large enough to fit all your stuff on. Right now I am towing an enclosed car hauler behind my MH. All the parks have accommodated us with a large site or parking for the trailer at no addition charge. Nor have they charged me additional for the car I unload from the trailer to use as a daily driver as I explore nearby sights and attractions.