I watched a movie MANY years ago about this family on holiday in a big, what are they called... Caravan-cars, like in "From Dusk Till Dawn". Anways... They somehow came across these really sick people living on this farm somewhere who had really sick experiments going on in their barn. I think the parents and maybe a brother or a sister of the main character, who was this girl in a wheel chair, were taken by these horrible people and done stuff to. And I just remember the end of it: The Final Girl manages to run one of the sickoes over with the car. A really twisted film celarly inspired by TCM and THHE.

Anyone got a clue?