Das ist stimpt gennau! Good point, Barry! The problem is, what to use? I don't think anyone makes a stand for the exact purpose stated.
Maybe one of those tubular tri-pod speaker stands? they hold a lot of weight (the better ones) and you could mount the receiver on the bottom of the cab.
I was also thinking of those Ultimate Support (USS) keyboard bench seats. They're black tubular Aluminum, are foldable, and they are height abjustable. Take the bench off and substitute the rack. If the thing'll hold my lard *ss, it'll hold a rack.
Just my two cents.
I have an old tubular galvanized tri-pod style combo amp stand that would be perfect. It folds and has a screw-in receiver that could be mounted on the bottom of the amp. Right now, the receiver is bolted to a home-made slab of three 1-thick face-jointed MDF boards and covered in laminate(formica) which the amp sits on like a table. The stand originally came with a single black-painted 3/4 or 1 MDF board with well-nuts holding the receiver on and as soon as I put the amp on it, it started to bend, LOL! If this stand will hold my old '79 Fender Silverface Twin Reverb (just try picking that thing up to chest height, LOL!), it'll hold anything. It just needs to be pickled and painted black (galvanized steel is dull silver). Problem is, I bought it new over 20yrs. ago, and I don't think it's being made anymore (can't remember the name brand either).
Dave: That Quik-lok seems to be your best option. I would just make sure you put something on either the stand or the cases (or both) to make them non-slip as you don't wanna have your racks slide off 'em and fall.