I used one on my Mini Lite and it worked great as far as being able to see it from inside the truck. I bought another for my Ultra Lite and couldn't use it due to the front cap design (at least I didn't like the way I'd have to mount it). With a pin box mount on a fifthwheel, I'd do it. Now, if you have one of the Reese pin boxes that rotate at the turret, that mounting would be totally useless.
2015 Chevy Silverado LTZ - HD tow package
2017 Rockwood 2703WS Emerald Edition