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My left hand service brake handle is quite easy to bump and kick off when getting into my truck. Made for a very interesting ride off my trailer one time a few years ago. Don't think anyone witnessed it but if they had they would probably had a chuckle to see a guy ride down the ramps with his butt sticking out a half opened door.
I keep a rubber wheel chock in place when ever I am at a show so just in case it get bumped by one of any number of people I let sit in my truck during the show. Very cheap insurance against unwanted movement.