RETRUE Air Spring Bag Suspension Kit for 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 Toyota Tundra up to 5,000 lbs. Of Load Leveling Capacity Ride-Helper. Stabilizes vehicle while loaded and maximizes vehicles load carrying capacity. Adjustability is between 5-100 Pascal. Kit includes air springs, air line, fasteners, upper and lower brackets, inflation valves, push-to-connect air fittings and detailed instructions. Up to 5,000 pounds of load leveling capability. Fitment details listed in the product description. Air Spring Bag Suspension Kit. International Buyers – Please Note. If you are dissatisfied for any reason, please do not be quick to leave negative/neutral feedback. We work hard to make sure EVERY CUSTOMER 100% SATISFIED and resolve any problem for you. We will reply to you as soon as possible.