Scott,
Remember back to that happy day when you informed everyone about your new G2's?

Uncle Dave shared some thoughts as to effective, light-weight, setups that IMO, can still be applied here.

Ender4TrackMind,
You have some very good suggestions, some that I personally would use. But IMO, and based on the particulars that Scott had listed (35 lbs/under for additional speaker/amp and only for the larger room event), I believe the problem to solve here is getting a bit more bass out, occasionally, while keeping the overall load, setup time, storage, etc down as small as possible. Again, IMO.

In regards to 'polishing a turd', thats the way I live. I won't bore you with the details as to why, but they basically always come back to money and very little space for doing my music hobby. By the way, I use Turdull Wax