Now I have it! Just finished putting rollers on the bottom of the 15" cab. It is marked 150W RMS...but that's not going to wrorry me.
Here it is...
And here it is with my 2x10 and amp....
So now I'm back in the situation of deciding whether or not to drag a 15 to gigs. But if I decide not to, I have both a 1x12 and 2x10 to play through.
ACE Hardware provided nice rubber rollers (front pair with locking levers) for about 8 bucks each, mounted with #10 screws 1" long. Each has a load rating of about 100 pounds, so on a 65-pound cab they should last: