Semi Trailer Mounted Bulkhead. Pro-Tech manufactures aluminum bulkheads for 96" and 102" wide trailers. Both sizes are available with a 10" or 24" turnback. Standard designs have been tested and rated. ProTech SEMI TRUCK cab racks are all aluminum and manufactured to ProTech's highest standards. They come in standard sizes or can be custom made to fit any truck. Through customer input, ProTech has developed a wide range of options for Cab Racks and Droms. Some more popular items are featured on this page, and many others are available. ProTech aluminum Droms are designed with load bearing Decks, capable of carrying up to 1,000 pounds per lineal foot of deck (example: 4' Drom Decks can be loaded with up to 4,000 pounds).