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Thank you all for the responses. Here's a big part of the problem - I'm dumber than a bucket of nails when it comes to these mechanical issues. I don't understand most of the terms in the replies. But, I was hoping that if I laid out what I have to work with that someone can give some specific input on what my essential needs are. For exp: I've got the Caravan and the max load I can pull is about 3K lbs. It will be a 16 or 17' trailer. It's a 3.6 litre motor. And, I need the entire works meaning the parts, electrical wiring, etc. It seems like this should be easy to diagnose but I'm getting just too many different answers. I'm stuck with the Caravan due to financial constraints.