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Discovered a nice bonus while using the cart for the first time this morning (live thread here), the cart raises the smoker to a much more convenient working height - no more stooping over!
When I purchased my Smoke Vault, I experimented with some fairly heavy duty casters that swivel and lock. The experiment worked so good, I just kept them on. I do like the looks of your rack though. Thanks for sharing.
I thought of casters too, but figured the legs were too flimsy to handle them. (The legs have some flex to them, which isn't a problem when the unit is just standing there.) I also didn't like the idea of drilling into the leg and thus cracking the powder coating and possibly giving corrosion a head start, which is why I went with the clamping scheme described in the construction narrative.
You're right about the legs being flimsy. I braced them with some 1 1/2 inch thin angle that already had holes and slots in. I don't know what it was designed for but like I said it was an experiment. I just roll it across the garage floor, out the door and hook it up right beside the garage (all smooth floor).
I have to wheel my unit out of the garage and down a slight (and slightly rough) grassy slope to my patio. It's not very far, but casters simply won't work. (On top of the other issues.)