If the explorer does not have the towing package, which includes the class III hitch and transmission cooler, I'd pass on towing this much weight. The 2800lbs doesn't include gas and gear which can easily run you up to 3500lbs. You'd be well served to 1st find a 19 or 21ft boat to pull for a day. If you expect 70mph on the interstate up and down the hills then your expecting quite a lot. If you want a 20 footer and want to stay with the explorer then you really need an aluminum boat something like this Xpress which is rated for 200hp.

http://i147.photobucket.com/albums/r...1/P1010131.jpg