Amazon.com: ARKSEN 24 Inch Heavy Duty Aluminum Bar Tread Tool Underbody Box, Waterproof Square Truck Storage Organizer Chest for Pick Up Truck Bed, RV Trailer with T-Handle Lock and Keys - Silver :
Amazon.com: Buyers Products 1704305 Black Steel Underbody Truck Box with T-Handle Latch, 24 x 24 x 36 Inch : Automotive
Buyers Products Company 24 in. or 36 in. Poly Underbody Tool Box Steel Mounting Bracket Kit 1701000 - The Home Depot
Installing a flatbed toolbox - YouTube
Mounting an underbody toolbox on a deckover trailer - YouTube