A couple years ago I moved a wood garden shed with my car hauler. Jacked up one end and put a couple sheets of OSB under it and a couple more on the ramps. Then used the winch to skid it up on to the trailer deck. Getting it off the trailer was just as easy. Wrapped a cable around the base and used another truck to pull it off. The shed was 6' X 10' so it fit perfectly on the 16' trailer. The move was about 3 miles.
A buddy who I worked with remembered this and gave my name to a girl who has two 12' X 14' sheds to move.
I told her I wasn't interested. Being 12' wide they would require oversize permits and pilot vehicles front and back. They have to go about 30 miles and over a bridge, so everything would have to be legal.
I figure two steel beams and lift it up high enough to back the trailer under and two more beams to support the weight while on the trailer. This would require a ton of cribbing blocks. Then two sets of warning lights for the pilot vehicles and another set for the tow vehicle.
Can't see myself making any money off this.