The Ratchet-Riser is an easy-to-use trailer stand that increases dock safety economically. The Ratchet-Riser can be used as a trailer stand (100,000 static load capacity), as well as a trailer jack (40,000 lbs lifting capacity). To use, simply place the positioning handle into the receptacle and ratchet the trailer stand to the required height. The Ratchet-Riser has an adjustable height from 39.5" to 51". Door Doctor recommends using two Ratchet-Risers per trailer. Prevent landing gear collapse and create a safer working environment with the Ratchet -Riser.