Many people do not like to trailer their laser for many reasons. Most of these people will either cartop their lasers or they will leave them at their club on a rack. Almost the only way to get the boat from the rack, rigged and in the water is by using a dolly. It is usually tough to find a nice piece of grass to rig on if you borrow someone else's dolly or a club one.
Dollies come in all shapes and sizes.
They range from popular Seitech Dollies , to ones made out of different types of pipe. I have also found some interesting ways of launching a boat on a dolly single-handedly. This would probably work for a trailer as well. Here is a wooden dolly modeled after the ever popular Seitech. The dolly uses regular wheel barrel wheels.