After looking at the problem I discovered when you lock the wheel it also locks the rotation. Took my Dremel and cut the lock tabs on the wheel (s) so now all I have is a rotation lock on 2. The other 2 wheels have a brake and rotation lock. Works great. Did need to re-mount the 2 fixed wheels I...
I have the competition base and all 4 wheels swivel. It works great with one small issue. As I pull it from my storage are going down the ramp some times the back wants to pass the front. If I had a second person on the back this would not be an issue. Or if one set of wheels did not swivel it...