I had the same hitch that came with my toyhauler. Looks to be 16,000 rbw. It also has the slider. It has a single bar that locks around the hitch pin. If I remember right, I found some information on the internet about it, enough to understand how to use it. I found it to be a serviceable hitch, although it made me a little nervous towing with the windows open because of the shifting noise. I had some trouble hooking and unhooking... the pin needs to be just right. About 1/4 inch space between the plates seemed to work best. I sold it after I got a "deal" on a "better hitch.
2007 Weekend Warrior Superlite, 28.5 foot
2015 F250 King Ranch
Lots of Wiener dogs and some otheres