I prefer to bungie cord shovels and axes to the sides/top/botom of racks (gas can or tire or roof or whatever). Gives you more flexibility in you loading and arranging than a dedicated mount. Takes less room too.
Wow, I like the quickfists, I would not really rely on bungee straps to hold things down during a collision, but, ultimately the brackets that go to African Outback's Racks are awesome and hold the shovel in a very reachable, very secure way. HTH.
How heavy is your shovel? A couple of good heavy duty bungies are far and beyond strong enough to secure any shovel I can swing against any G force I will ever see in a collision.
so basically some low life could just walk up to your truck and walk off with a new shovel? Im locking mine, a good chap source is to go to hardware store (lows, depo) and go to the plumbing department they sell a round hinge that you clamp over pipe with rubber to stop leaks. They come in diff sizes and you you drill a hole and lock it. $3.00