I usually sail alone, and even though the little 8' pram dinghy I built a few years ago is relatively small it still weighs enough to  make it a little awkward to handle on my own. Especially if the launching  ramp is a good distance away from the car park.

To make it a lot easier to manhandle the dinghy around and to launch  it, I made a single-strut landing gear. It's simply a plywood/yellow  pine construction with the yellow pine acting as the cheeks to the  plywood. As can just be seen in the sketch below, the cheeks  are shaped to match the rocker of the boat. In use, the gear is simply  inserted into the dagger board slot, the boat turned right side up  and trundled away! A piece of cake.

One other useful advantage is in launching the boat. You can move  it to the launching ramp like a wheelbarrow, roll it down the ramp and into the water and leap in. If you have attached a lanyard to  the bottom of the landing gear (which you certainly should!) and carried it  around the topsides and secured it to one of the rowlocks or any other convenient attachment point, you can push the gear out of the dagger board slot with the dagger board and retrieve it with the lanyard. Another piece of cake!

The wheel is any wheel you might happen to have lying around or you can do as I did, buy a cheapie from your local home center. Don't bother with fancy hardware, any kind of bolt axle will do. You're not going to the Hebrides with this thing, just to the local lake.

Happy trails!