I'm game for 60RG tubes - I love the 55, but it can't fit some of mine (go figure). IIRC, the 55 goes from 5 inches to 8... I'd like to see a 60RG tube that is 4"-7". That way NUBs would fit it comfortably (no vertical rattle-space so the caps don't get cracked!) as would MUWAT in the 7" format... If possible, I think 4-7 is the right window.
Count me in!