My name is Rodrigo Morales, sales manager for Power Door and Step the North American distributor for Autocool products. We offer Power Steps and power door kits for the Mercedes Benz Sprinter, Dodge Promaster and Ford Transit . Our Step is 47 inches which covers the full rear door. Our step has the largest stepping platform for added safety when entering or exiting the vehicle. they can hold 1100lbs, and has been tested for 750,000 cycles. Our Power door kit is chain driven and the door does not have to be removed to install. It works with a separate remote control and or a switch on the dash. Steps are are about 4 hour install and the door kit around 13 hours. If you have any other questions please feel free to call me or email.