Reese Elite fifth wheel hitch.

I assume the OP’s son has nothing installed in the truck now. If I was just reading on line (with no experience), I would be looking for a B&W dealer, a turn over ball, and a companion. However, when we ordered our new F-350, I thought that I would let the factory get the under bed Reese mounts in just the perfect place (as opposed to the neighborhood shop whacking away at the bed). Since we got the short bed (6’9” in Ford land) we needed a sliding hitch. While the Reese Elite fixed is a little pricey, the slider is stupid, ridiculous, pricey. Anyway, we ended up with an 18K Elite Slider and it is a well made, good working hitch. It latches completely first time, every time. We also have some experience with the Reese R16—had a lot of trouble getting it to latch. Most of the time it would latch half way, but not enough to lock. The Reese hitches have a little built-in slop to the puck mounts on the hitch. They can be loosened, moved, and tightened for better alignment with the holes in the truck.