The original idea was to put holes in the 1in flanges pointing up/ down and bolting that into the frame with a sorta of square of 1x1, (ill post a pic later)
I do see how it could twist and bend, I have some ideas...
Im thinking we may stick with 2 wheels for now, I don't think its worth a total redesign of the bottom GB ATM, What id like to do is just get a prototype made to see how it it all goes together and see what has to change.
I might play around with a 1 wheel version if I get the time to. This is actually my first major CAD project, so I am pretty proud of it, but I see a lot of valid points that ill try to implement. I really appreciate the feedback.
PS:
This is the large tapered bearing I was talking about
http://www.mcmaster.com/#5709k31/=smy6cy