I have a air birth M1500 boat lift that is designed to lift a 32 to 46 foot boat with a max weight of 33000 lbs. it is located in port royal landing marina. It uses a 30 amp 120 volt air box blower to lift the boat. It doesn’t require any additional posts to be drove. we paid $48000 new shipped from Australia. Will take $27000. It needs at least 10 feet of water. If you have any question email me at holdenoncharters@yahoo.com