I tried a Tone Tubby 40/40 12" ceramic in mine, and I was not real thrilled with it. I loved it in my Peavey Classic 30, but with the Tramp (and my admittedly short testing time) it didn't have enough oomph for me. I A/B'd it against a Red Fang 12, which is what I have in there now. Definitely a different beast - a lot more bottom than the 40/40 (which is why it works in the C30, interestingly). The RF is almost boomy to me, but if I dial the bass back a little it's great.
Dunno if that helps - maybe a little?
Kind of depends on what you're looking for, and of course what model speaker you're going with.