CASTERS ON TILT BACK AMP

I take it it's sort of a monitor wedge type shape......good question. Pretty much anywhere is going to be tipsy. Perhaps a dolly board to set it on? Basically a piece of plywood with wheels on it.
 
Home Depot sells a little light weight aluminum hand truck that is perfect for the BA115...I've got one. The wheels are big enough to negotiate steps. It's about $20 and well worth it if you value your back. The amp is only around 40 lbs but that's still a lot of weight to carry.
 
Looks kinda lame but If you found some casters that didnt rattle you could do a side mount like this dude did:

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