I would suggest running whatever devices are sharing the same power (perhaps main and guide camera and focuser (and maybe dew heater depending if the controller you use generates noise) from a RigRunner mounted on top of the scope, and then you only need one power cable up through the scope to the RigRunner.
Dr. Barry Megdal
Shb Instruments, Inc.
19215 Parthenia St. Suite A
Northridge, CA 91324
(818) 773-2000 (818)773-2005 fax
Dept. of Electrical Engineering