I used to carry a 12 ft Jonboat on a Pinto SW. I was young, strong, and almost took out the back window a couple of times. If you're serious about putting a watercraft in a minivan, try to get a riding lawn mower in the same vehicle. Don't forget about the angle you'll have coming out of the water, and don't forget to do it when you're tired, like you've been fishing all day. Then, I used a 2WD Ranger to tow my 12FT SemiVee for about 20 years. Twice, I got stuck on the ramp, and had a hell of a time getting out. Now I use a 1996 F250 4WD. My first choice would be a Ranger sized 4WD, like your Bronco, with a trailer. I prefer the Pickp because I can see the trailer better.