I take it the "dolley" that came with the boat is only for manuevering it by hand and not designed to be towed by a car?
If you don't want to cut an inspection port, then get a little fan, Vtgent49 recommends a computer fan, and keep it running at the transom drain over the winter to dry it out. A little fan because they tell that too much air pressure can blow the boat apart at the gunwale seams.
You can do something like this with a utility trailer. I believe this image is from D5 in Canada.
...or a Kitty Hawk trailer designed just for the Laser. It doubles as a dolly right from the car because it's so light.
Either type of trailer tows better with 12" diameter wheels. Many utility trailers as well as Kitty Hawks come with 8".
. I need to figure out how to make a pattern of the curvature of the bottom of the boat to fabricate the carrier to attatch to my trailer. Any input from anybody appreciated.