Lifting A Boat Off A Trailer How Do You Switch Two Fiber Glass Boats From One Trailer To Another?

How do you switch two fiber glass boats from one trailer to another? - lifting a boat off a trailer

I have two boats, about 1,800 pounds and have two boat trailers. A truck is broken and has a boat on the trailer and another is good, but a broken boat has in him. The two boats are too heavy to take off the trailer and put in the ground. How do I get a good boat on the trailer without the ships in the waters for a change?