HO RTR 85' Flat w/2 40' Trailers, WP/Black #1 Key Features Fully assembled and ready to operate Includes two 40' trailers with new underbody and vinyl tires Factory installed metal grabirons New metal underframe for correct rail height and optimum performance Machined RP25 profile 33" metal wheels Newly designed swing mount coupler boxes Magnetically operated knuckle couplers