Sean

I started off with two combos (the Marshall and the Mesa Walkabout in its Scout combo form). The Marshall wouldn't sit well on top of the Scout when I decided I wanted the guitar speaker physically above (to reduce the footprint) so I took the head out of the Mesa and used the TWO10. 

I suppose you could use two identical combos, have one EQ'd low end and the other biting and clanky... or something. Or have them both set to the same EQ with one on one side of the stage and one on the other, á la Slade... I don't know really, I've no idea what I'm talking about. *puts sherry away*

Many years ago (late 70’s) I bought a R**********r stereo for not a lot of money (£220 IIRC) and ran the R***-0-Sound output with the bridge pickup through a Hiwatt 100 head and matching 4x12, and the neck pickup through a Marshall 100 and matching 4x12. The R** was fitted with Superwound strings (the ones  with the exposed core at the bridge saddle, and ball-ends you fitted yourself). It sounded like a grand piano! A major b*ll-ache to transport in a Citroen Dyane, though. I abandoned the idea (and the R**) after only a handful of gigs...