Fast and Fancy Revolver Shooting by Ed McGivern has a section on shooting from running boards I found interesting.
Then there is a Cowboy Action shooting event -Mounted Action Shooting or shooting from horses (my wife and grandaughter are into this).
A few years ago Zak Smith put on a Multi Gun match at Gurnesy WY where we shoot from a HUMV, that was fun.
In my younger years I use to shoot jackrabits on a dirt bike.
Fun yes, practical for SD no.