Wrecker Manuals Wrecker Manuals When ordering parts, please refer to your unit’s Sales Order Number, Serial Number and Model Number. This information is be found on the aluminum tag riveted to the inside of the driver’s side toolbox of the main body. MPL40 Wrecker Bed This manual covers Jerr-Dan beds with S/N 0230005237 TO PRESENT MPL-NG Wrecker Bed This manual covers Jerr-Dan beds with S/N (0230005338) TO PRESENT MPL-NGS Wrecker Bed This manual covers Jerr-Dan beds with S/N (0230005342) TO PRESENT HPL-35 Wrecker Bed HPL-60 Wrecker Bed JD16INT Medium Duty Wrecker – 16 Ton Integrated With PolyBody JD16INT Medium Duty Wrecker – 16 Ton Integrated With Composite Body