Vice to use on your "Trailer", Mounts in a typical Trailer Stake Pocket. Slides right in. There is a Bolt to keep it in, even when traveling.
All the Welding, Drilling, Planning and Purchasing of the items is DONE
This is designed so it can be securely left in the pocket while traveling. Then remove 1 bolt to remove it from the trailer.
I built this myself Custom for my Flatbed Utility Trailer for on-the-job repairs, It has Proved to be Priceless at times. Also, I do tree work and have used the Vice to hold my chainsaw bar while I sharpened the chain. This gives me 2 free hands so I can get the job done Accurately and Fast.
Pic 4 on the left shows the C channel that slides into your stake pocket.