@ Padden Q
Unicable LNB & usals is possible :
as LNB I recommended to You use LNB for 24 or 32 unicable channels, eg Durline or Inverto
cable - > only one from motor
cable from motor to splitter
cable from splitter to box 1:
1. box vu Duo 4k < main>:
< 8 demodulators >
connect only one cable to tuner A, set tuner A for usals (your position) , unicable LNB, channel 1 | tuner B unicable LNB, channel 2, set to linked to tuner A | tuner C unicable LNB, channel 3, set to linked to tuner A ...etc.
but unicable channel 1 set up for tuner A for every satellite positions, what you want to receive, and unicable channel 2 set up for tuner B for every satellite positions, what you want to receive, and unicable channel 3 set up for tuner C for every satellite positions, what you want to receive ...etc.
cable from splitter to box 2:
2. box vu Ultimo 4k <2nd>
< 8 demodulators >
connect only one cable to tuner A, unicable LNB, channel 9 | tuner B unicable LNB, channel 10, set to linked to tuner A | tuner C unicable LNB, channel 11, set to linked to tuner A ...etc.
but unicable channel 9 set up for tuner A for every satellite positions, what you want to receive, and unicable channel 10 set up for tuner B for every satellite positions, what you want to receive, and unicable channel 11 set up for tuner C for every satellite positions, what you want to receive ...etc.
so now You are occupied 16 unicable frequencies from unicable LNB (8 or 16 are still free for use), and just tuner A from box 1 (vu Duo 4k) control the motorized dish.
but if only tuner A from main box is active, only than is possible to move dish. (my experience)