Are we talking about an ARF, or stick built? Stick builts I've seen are pretty sturdy. The 67" OMP Fusion I had for a while was pretty sturdy in that area, but had issues in other places. The Chinese ARF design that you see everywhere (like this one: http://www.sdshobby.com/new-65in-sba...or-p-5360.html ) sold under about 6 different brand names, could use some help. As I understand it, the hardwood doesn't extend back far enough.