2019 Diamond C GTU 20' x 83", 20FT SIDE LOAD AND REAR BIFOLD REAR RAMP. BRAKES ON 1 AXLE. THIS TRAILER WILL DO IT ALL!! 2019 Diamond C GTU 20' x 83" Need a heavy duty construction trailer, landscape trailer, or general purpose commercial grade trailer? Diamond C tandem axle utility trailers are constructed with superior strength and durability in mind. Customize your next work trailer with us. GENERAL TANDEM AXLE UTILITY TRAILER A robust take on the general use tandem axle utility trailer market. Built to haul. Built to trust. Built to last.