I guess I continue to be the oddball. Two seperate systems presumes you will have a leak only in the brake line. Ya, and you guys never landed with the gear in the up position
I use one air system on all my airplanes with one fill. I install the tam's unit for loss of air situation and I am done. Since I have had the tam's unit installed, I have never landed gear up (except one time when there was a mechanical bind on the nose gear, but that does not count

)
I have suffered loss of air, and the Tam's unit threw the gear out while I was inverted at full speed.
I came around and incredibly had enough air to stop the airplane. THANK YOU TAM!