Step Deck Trailers Prices and Options 54.5′ & 53′ Semi Step Deck 12.5’/42′ hydraulic dovetail,aluminum wheels, air ride,headache rack, 25,900 GVWR. $72,500 Options . Spare Tire/Wheel = $500 Extra undermount toolbox = $500 42′ Semi Step Deck 10′ top deck /32′ bottom deck, hydraulic dovetail, steel wheels, headacherack, 2-15k axle, 25,900 GVWR $50,149 Options . Extend top deck 2 foot = $2500 Aluminum wheel upgrade = $300 each Solar charger with plate = $330 Extra undermount toolbox = $400 Wireless remote system = $2250 Electric over hydraulic disc brakes w/ extra tool box (for use with steel wheels) = $3500 Air brake system = $4500