Jack-IT® PRO is our heaviest-duty model for carrying two bicycles while offering new ways to utilize optimal space over the A-frame trailer tongue with built-in receiver ports for carrying more bikes, generators, grills, and other outdoor living gear with accessory add-ons. Extra heavy-duty PowerTower™ A-frame mount platform with three integrated round receiver tube ports for accessory add-on Expandable bike and cargo capability with accessories, sold separately: PRO Tray model #B02592, Four-IT model #B02486, Stack-IT model #B02479, and Table-IT model #B02462 Carries two bikes mounted above the electric jack and front wind manual jack of A-frame cargo trailers and RV travel trailers 360 degree rotating TwinSpin™ functionality on V-Wing and stinger bar for easy bike loading and storage Lock down security with two spin pin locks and cable for securing bikes to rack Adjustable wheel cradles for all standard bike sizes and frames, rated for bicycles with 22 inch wheels or larger, and up to 3 inch tires Weight saving aluminum wings with larger wheel cradles accommodates wider range of standard bikes Rated for up to 40 lbs per bike and 180 lbs of overall payload for add-ons (add-ons sold separately) Compatible with electric jacks up to 22.5in in height (measured staring from the coupler) Weighs 48 lbs empty Not rated for use with covers, bags, or other non-Let's Go Aero Accessories Patented Product