On my boat trailer with air springs I simply ran a pair of these
2 Manual Paddle Valve Switches Control Air Ride Suspension AirLift Performance | eBay
Some air lines and small 9L air tank with shraider valve in it. Fill the tank to whatever pressure compressor gets to 120psi or so - then use manual paddles to up and down the bags till it runs out of air
Dumb and simple
I have two eyes and can judge angle / height pretty well !!! Don’t need no stinkin sensors
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