At least they were smart enough to put duallies on the toyota to support the weight of the boat.

I think the bigger question is how did he get it up there???  There are no wheels on the boat trailer.

Necessity is the mother of invention! As a person who camps to fish, there are very limited means to have a camping  vehicle or trailer, transportation  vehicle once at you destination, and a means to tow a boat. Tent camping, no problem. Tent in the back of the truck and boat trailer behind you. Motorhome camping you can pull your boat trailer, but once at the campsite, no transportation vehicle unless you want to break everything down. My best solution has been a slide in truck camper. Once at the campsite, off load the camper and your have your vehicle free for transportation.