I installed a power pass splitter on the cable in from the power bay. I intend to connect the tailgater to that cable input. The splitter is installed before the OTA/cable switch. One leg of the splitter goes to an A/B switch. The other side goes to the OTA/cable switch. The other input of the A/B switch is the roof dish. Gave this arrange a trial run by connecting my home dish to the cable connection in the power bay. Either dish will now pass signal to the receiver. The only thing I didn't try was the OTA antenna. I have no reason to doubt that it will work.
Thanks for everyones suggestions.
2013 Berkshire 390RB-60
toad - 2002 Jeep Wrangler Sport