Quote Originally Posted by cubtractor View Post
I am thinking about installing a valve on mine. 99% of the time I usually don't need it but there a few hilly areas...
This was exactly why my new Model IV has a parking brake. In a group flight we stopped at a dirt strip - Doug Bar - on the Snake river in Hell's Canyon on the Oregon side. I was last on the ground and all the flat spots were taken. I couldn't exit the airplane without it getting away from me. Glad for the friends who were there. The other time that comes to mind was the stop at Jackpot, Nevada with winds much stronger than we had estimated. release the brakes and the airplane wanted to weathervane then roll backwards.