The 7x16 enclosed trailer size is a popular solution for contractors, hobbyists, and homeowners. Rock's trailer sales has a huge selection of 7x16 enclosed trailers from manufacturers like Pace, Haulmark, ATC, Homesteader, and Formula. All our 7x16 enclosed trailers are tandem axles with electric brakes on both axles. ATC trailers are built with aluminum frames. Our other manufacturers are steel-frames.