Merritt Between Frame Storage Box With Mounting Kit Model 253Merritt Between Frame Storage Box With Mounting Kit Merritt builds some of the highest quality boxes in the industry. Whether you're a truck driver, owner, or a parts manager for an auto shop, you can't go wrong with the Merritt brand. Merritt boxes are built with high strength materials built to last in harsh environments. Features Utilize unused frame space and add additional storage areas. Heavy Duty designs on all storage boxes for longer life.