I have a question, is it possible to have a motorized BUD for C Band and a motorized KU Band 30"+ dish and have the receiver contrail both of them?
Not suggesting a combo C/KU unit. You are correct, the performance on combos are unpredictable and most have poor results. I was suggesting using a KU-band LNBF with dual outputs and a C-band LNBF with dual outputs or bandstacked versions of a separate KU and C-band LNBFs.
Yes, you could connect C-band LNBF to one tuner and KU-band LNBF to the other, but the dual tuner receivers are rare in North American market. The last one that was sold had problems managing the two tuners and is no longer sold. There are some great multiple tuner models from Europe, but be prepared for very high cost and little or no support for a North American user.
Bigger is better. If you can install a quality c-band dish, 12 foot will provide better signal quality than a 10 foot. The DVBS2 signals require the best signal possible to reliably lock.
...To install a 12' dish I'd need a 4"X12' pipe? Any idea who sells them?