I've seen the dubro on a 1/4 scale super cub. It wasnt holding up too good. The plastic was bending to the point of almost dragging on the ground. Granted, it took awhile to get to that point. But I think metal would be the way for the larger. I am using sigs large tail gear setup on a busa 1/4 scale J3.
http://www.sigmfg.com/cgi-bin/dpsmar...FV4.html?E+Sig
Edwin