Thanks for your response, here's what I know.
Model: Mercury Mountaineer.
Drive: 4 wheel drive.
Transmission: Automatic; has a transmission cooler on it.
Both my wife and I looked in the manual that came with the car, and could not find the towing rating. But by going to different trailer venders, they are able to look it up and say it is between 5,500, and 5,700. We are looking at the X-210 WBS, which is 3,730. I know that it is less than the max tow capabilities of my rig, but was curious to know if anyone uses a similar rig to tow with and their thought as to how it handled and if it needed a lot of other things to make it work.
Thanks again for your thought.