Yep, 3 x GS112's'd be 2.7 Ohms, 900 watts and they'd be resaleable, stackable and still a 1 handed carry (each). Can you borrow one and give it a try? I'm a bit too far away methinks.
Oh and they'd definately 'work' too.
In fact I always think 2 x GS112's are more than the sum, wonder what 3'd be like