I recently sold my suburban and need to haul a boat about 5 miles to a lake. The boat is a 21 ft air nautique. The terain I would be pulling on his flat to mild/moderate grades 25 to 30 mph. My 66 Bronco has a stout hitch on it, but I am trying to decide if it could handle the load that far without killing it that far. The boat is on a tandem axle with good trailer brakes. Any feed back would be appreciated