Re: Putting Casters on a Nice Amp / Cab
Hopefully, the Boogie cab was deeper than most for stability. The wheel's sockets tend to be inboard of the amps edges. Mesa, and any good tube amp brands are quite top heavy.
The rear wheel sockets are easy to put in, but the front sockets need better planning, as the front baffle board may be tilted, and you never want to put the drill bit through the front of the baffle, or speaker. Moving the casters back from the speaker baffle makes the top heaviess even worse. Then, unless you do not care about scratching wood floors...the regular amp feet need to be installed, somewhere on the bottom.
You could take some strong cabinetry plywood, and some quality surface-mount casters*...and create a righteous shallow, heavy duty wheeled "tray" of sorts to snugly carry the amp while is to be wheeled around. Instead of pop-out casters, you are simply making a box, that lets you pop-out the amp instead, if you like. I suppose a couple nylon web tie-downs could be used to strap over the top of amp, virtually making it one solid piece while transporting it.
*Nice heavy duty casters (that have rubber treads) can be found at industrial suppliers, old fashioned hardware stores, and perhaps the big box hardware stores.
edit: forgot to mention: I have used the Ernie Ball casters with good results, but the top heaviness issue increases as the depth of the cab decreases. A small combo is easier to knock over than a deep cab, IMHO.