Aspen’s PD-Series (Petroleum Series) designed for hauling skid mounted loads and construction equipment which primarily serve the energy (Oilfield) industry and are suitable for both on road and off road applications. Configurations vary from payloads of 40 tons through 85 ton capacities, with axle configurations ranging from 8 through 13 axles (including truck axles). Aspen PD-Series trailers feature flat decks (no gooseneck) with tail rolls or square tail rear frames. PD-Series trailers can be configured with various deck widths and lengths including custom options. The PD-Series trailers have common air/regulated air suspensions, with transporter equalization achieved by combinations of jeeps & boosters with common air/regulated air suspensions. Aspen’s PD-Series of trailers are available in specific regional interstate configurations (United States and Canada) to maximize trailer configurations for specific regional regulations.