I had 2 Air Lift bags with a compressor installed on my ‘21 Silverado. It came with a remote fob to adjust the air pressure. I tow a 32 ft RV and an open air car trailer. I love the system. It’s there when I need or just along for the ride when I don’t. $1500 installed which I didn’t think was too bad for the assurance I get. They really took care of any trailer away I had before the bags where installed.