Abstract: Cargo boxes for trailers that support boats, jet skis, motorcycles, off road vehicles and power equipment A first embodiment has ninety degree angled channels in rectangular shape that are bolted to the front of a boat trailer frame or rear bumper of a towing vehicle. A hinged strap fits through the handle on five gallon gas cans or ice chests. One end of the strap is welded to the channels, the second end has a slot for fitting about a loop attached to a front channel. A key/combination padlock inserts through the loop locking the storage container to the channels A second embodiment has an I-Frame formed by two angled channels separated by telescoping adjustable plates wherein the storage containers, or a hinged box can be attached thereon by bolts, and BUNGEE.RTM. cords. The components of the cargo boxes can be formed from stainless steel, aluminum, galvanized steel, molded plastic, fiberglass and the like.