@CL400Peavey tell me more about the "Dually" do you have a link to a site i can buy from and have a look?
I would start by doing a search here on TB for the greenboy Dually. There is a fair amount of info. Additionally the Dually is available through greenboy's authorized builder network. I have ordered several cabs from Dave Homer at Lazarus.Bird and he has been a joy to work with, his site has a write up on the Dually as well. All of greenboy's builders are fantastic and will be more than willing to answer questions. I would contact TB users Zoomie, and write up on his cab. Both use Duallys and love them. Zoomie has a very good Lazarus.Bird. Both would be more than willing to answer questions.
As I said for your tonal goals the 3015's would be my choice. Pretty much what you are getting is a 215, that can handle an honest 1,000 watts. It will be louder than an Ampeg 810e, and have a more authoritative low end. If I was going back to cabs with full range drivers, it would be my top choice.
