I have about 1100 hrs. on this one and it's time to replace all the idlers and spindle bearings. All but bearings on one spindle are getting noisy. Check on full XR7 spindles and after hearing price it looks like spindle bearing only replacement is what I'll go with assuming the VX4 spindles cost the same.
My front casters shimmy since day one at speed especially on hard surfaces. Even more since I adjusted the steering stick stops to get closer to 15 mph. Since this post I talked to Dan at Hustler headquarters and found they did make a friction shim to be installed on top of the top spindle bearing to reduce or stop the shimmy. I believe this is similar to what they did to the VX4 casters.