I will be curious if you figure anything out. I definitely have an r-pod garage model in my future and this is a pretty critical change they need to make. Do they at least have coax output there so you can hook up your receiver in the garage?
Honestly my best suggestion is what I do in my roo, i use a wireless hdmi box and that lets me move the tv inside and out with my dish receiver in a permanent location. I bought an old LG wireless box for 10 dollars and modified it to work on any tv brand.
I saw they switched the garage to a metal counter and I like that change...hopefully they will continue to add connectivity back there and really make that as useful as it should be.
2013 F150 FX4 EB