I just flew from New Orleans to Visalia, CA and back, total of roughly 21 hours of flying. On one of my stops at a small airport with cheap gas, the winds were really blowing. As I got out of the airplane, as the canopy kept wanting to shut on me, the plane started moving. Luckily I was able to get it chocked quickly. When I was deciding whether or not to use a parking brake, I didn't really think of that scenario. If I had to do it over again, I would install a parking brake. Now I am going to have to figure out how to install it after the fact.