Aspen’s SD-Series (Super Haul Series) steerable dual lane trunnion suspension transporters are designed for crane-loaded payloads. These primarily serve the super haul industry and are for on road applications. Configurations vary from payloads of 125 tons through 225-ton capacities, with axle configurations ranging from 10 through 24 axles (including truck axles) unless the transporters are in a wagon configuration. Aspen SD-Series trailers feature double drop and high frame, wagon style (tractors push/pull via drawbar) decks and non-wagon double drop and high frame (tractor supports payload via jeep or spreader frame) configurations. The SD-Series trailers have dual lane, walking beam 8 wheels across per line “trunnion” suspensions with transporter equalization achieved by mechanical equalizing steerable dolly/dollies. Aspen’s SD-Series of trailers are available in specific regional interstate configurations (US and Canada) to maximize trailer configurations for specific regional regulations.