Do you use that rig with the 429?
No. The unit I have is designed for the B206/B206L/B407/E480B.
The AviGround unit is similar to other trolleys in years gone by, they are very difficult to line up on the skid tubes correctly.
This has not been my experience. Just the opposite. The remote control capability allows one to stand where the alignment can be easily verified and fine adjustments made on the fly. May vary with different helo models.