KEEP IT SIMPLE, every component is subject to leak, so first reduce their amount.

I prefer Spring Air like single action retracts, 1 fill valve, no gauge, but install only water tested components in the planes, and an amazingly high percentage of them fail the test, some are easy to fix, some back to manufacturer. Most of them where Brakes, Spring Air button and level actuator, Fill valves, and small cylinders.

If you remain on dual action, the TAMJETS Failsafe is a very very usefull thing. Just use some restrictors to help that a single line leaking or unplugged cannot be fast enough to empty your tanks before gear is locked down, this at least for the brakes like , which are the most likely to give.

Important point is to get axial loads only on the valves, and lube regularely every moving part and seal.

I prefer mechanical valves and servos cause operable by hand and then keep positions.

And if you do not want to risk any leaks, use a dolly, or fly foamies !!

Daniel Rossier

PS: Sean, you are not alone in this way of doing !!!