I'll throw another dolly example out for you...I've been using this set up for better than 15 years. Never had an issue as long as you keep the dipper near perpendicular to the floor (so the boom can't drop). I also reconnect the hydraulic lines together into a loop. The dolly setup makes it very easy to reconnect the BH as you can position it exactly where you want it to line up with the subframe.
Also, note the ratchet strap holding the outriggers together.
Simple set up. As Jajiu mentioned above, sweep the floor before trying to move the rig.
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