I would too, go for the arizona brakes if it had a parking brake function( i know its in the works, but its been over a year now). Where i live, a line-lock or a wheel chock will not pass safety.
I know people have been having difficulty with ross from modern motorsports this past year, but there is a good reason to that. But its not my position to answer that.
anyways, back to the topic. Anyone have experience with the mm stuff?