Abstract: The present invention is drawn to a bedliner ballast system for pick-up trucks, vans and other vehicles to allow the operators of vehicles to increase traction on the driving wheels by adding and removing weight to the bed of their vehicle and therefore adjusting the traction of the driving wheels without sacrificing load carrying space. The design permits the owner to easily and quickly add or remove weight as needed by using a liquid contained within the bed liner. Liquid may be added to directly weight, for example, the rear wheels with a garden hose or water faucet at a filling station while preserving the entire rear bed for passengers or freight and the additional load may be easily and quickly removed. The design permits custom modification for a variety of vehicles and vehicle configurations.