Assuming I find a decent summer job after school gets out in a month or two, I will be looking to add a 1x15 cab to my rig (among other things). My problem here is that the 4x10 I'm running is absolutely massive, it's a Sunn 410H and the dimensions are 25.5" wide and 17" deep. I have yet to come across a 1x15 that will fit underneath this cab without a lot of overlap which obviously makes me nervous. Anyone know of an 8 ohm 1x15 that would be of similar size? Preferably I'd like one that has those indents built in that allow casters to fit snugly so I don't have to take the wheels off and carry the 4x10 around (what are those called anyway?). Also, anyone run a 1x15 on top of a 4x10? Is there any reason not to do this? I don't think I've ever seen a bass rig with the 15 on top other than my own the one time I borrowed one, and I wasn't a big fan of the sound although it was a crappy cab.