I bought this for my boat and about 6 months ago and absolutely loved it. It’s completely adjustable for your weight with a simple air pump. I was selling my boat and so I kept it to put in my new boat. Well, when I found my new boat, I can’t use this because it sits too low. This base measures 16 1/2” from floor to the top plate. My loss your gain. These are $900 new. Check out my feedback and buy with confidence.