You could also do what I have done. I plumbed my existing Air Slide 5th wheel line into the air bag supply line with a check valve. When I want more height I just flip the switch and wait for the extra air to raise the bags. Now the ride height valve is still deflating the bags but the input is greater so for a short time period I am letting in more than is escaping thus giving me more height and when I am done I flip the switch the other way and the ride height valve does the rest.
Wick
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