Re: 5th wheel question
Well, I will try to answer the best I can.
The Pro Series uses a solid bar, about 1/2 x 2" in size. Slides behind the kingpin and locks in. 16K and above use what is called a clamshell to lock around the kingpin. I have never seen, but heard of clamshells letting go, but only when not locked in properly.
I do like the solid bar...nothing gonna turn loose, but wear will indent the bar over time. A LONG time...a welder and grinder can fix it in just a few minutes if it really gets bad, but I have never had to. It really is a safe hitch.
Reese builds the 16K clamshell somewhat heavier, but the clamshell simply is more involved in manufacturing. As they build the 18K, 20K and 22K, they are again built heavier and cost more.
Industry secret here: Reese/Drawtite test ALL hitches to 80,000lb.
Again, with the trailer your talking about, the Pro Series will do just fine, but if you want more, they make them also.