How to add hydraulic trailer jacks. The total cost to do this is yourself is about 4500-5K parts & labor. This has paid for itself quickly as it saves a couple minutes every single day. Nobody wants to disconnect a loaded trailer manually. We have had this setup around 3 years with no hiccups! All upfitting work done in our shop. OEM Felling jacks, custom underbody boxes (2). Wiring, hydraulic lines, mount plug in pintle plate and that’s it. If you are local and want this done to your trailer we