I believe the KR-500 and G1000DXC could be upgraded for LVB control with some thought.   My LVB tracker ran an old Wilson 500 rotor that I modified for several years before it gave out and I had to upgrade to a 5500. Since the Wilson had no transformer (all 120 VAC), I did it with relays.   GL   Mike, K9QHO, AMSAT 33589