Use to own a Plymouth Gran voyager with a 3.3 litre engine. Used it to tow a 14ft aluminum boat loaded with camping gear from the valley floor to a lake 120 miles away at 5100ft elevation (and over the Fredoyner summit). I had no problems maintaining speed going uphill. We drove her to nearly 400,000 miles before replacing her with a Chrysler Towne & Country (same size engine). However, since I now have a Durango with a 5.9 liter engine, we are not using the T&C for towing.
Having 7 kids tends to limit my family car options.