Like any jack, I never get under the car until it's resting on jack stands. And I sure as hell don't trust ramps.

As far as the air valve leaking, my hydraulic jack no longer holds when under load but thats because it's a cheap one. I'm guessing that the Arcan uses a check valve to hold the air pressure.

Nate, I'm guessing that you have an aluminum jack based on your comment that 40lbs is a tank.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles