What is the difference between a retaining ring style swivel jack and a tubular mount swivel jack?
The retaining ring style jacks have a plunger pin assembly on the jack that allows you to pull it out and swivel the jack. The jack cannot be easily removed from the mount because of the retaining ring. Tubular swivel jacks have a tube welded to the jack. A mating tube is welded to the trailer. A pin holds the two tubes together. It is easy to separate the jack from the weld-on tube mount.