Here is what I was able to accomplish with a goal zero guide 10.
The guide 10 has a 12V plug in that goes from a small plug to the car style receptacle.
I plugged the car charger and the "charge clip" that Iron Mike speaks of to the receptacle.
The guide 10 battery pack could never trip the charge mode by itself. with the battery pack on and in 95deg direct sun, I was able to charge my rino for about 15% and that was it. It appeared to charge quickly, but the charge system needs to be pretty bad ass to charge the giant battery. The people at Garmin told me that is why they have never messed with supporting a solar charge system. They felt like it would take so long to charge it with a small system, no one would be interested.
By the time I hillbillied up this system, it added so much bulk and weight it wasn't worth it.
I am still waiting for the techies to find a good system, and I will be a happy camper.