This is a PullRite Superglide 4400 5th wheel hitch. Other than a scratch here and there, and now about 18 months worth of dust, it's like new. It was only ever used to tow my 13,000-ish lb Elevation toy hauler for 5,603 miles. I've purchased a LWB now, and no longer need the slider. I also have the PullRite SuperGlide SuperRail rails to go with the hitch, as well as the PullRite 3335 Gooseneck Hitch Plate that works with that same SuperRail kit. The SuperRails are shown in the picture below, attached to the gooseneck adapter, but are easily removed and installed under the hitch.
PullRite SuperGlide 4400 on Amazon: $1,432.58. I'll take $600.
Gooseneck adapter: $150