You might be able to do better than the dealer price. We have performance shops around here that do that type of work as well. You'll have to decide, but your truck is pretty new. If you hang onto it for a few years, the return on investment is there.
I'm a huge proponent of mirrors instead of cameras, based on over 30 years of experience driving trucks. The problem with a backup camera is its location at the rear of the vehicle or trailer. When backing up, the camera might have cleared an obstacle, but the entire length of the truck and trailer hasn't. That obstacle is still there, even though you can no longer see it in the camera. I know people who have backed into things because they were watching the camera instead of their mirrors.
While driving forward, the camera will show what's directly behind you - not particularly useful information. Your mirrors will show what's beside you and what's approaching from the rear. Vital information when changing lanes or making turns.
The tiny clip-on mirrors don't allow you to see the big picture. You need to see where the trailer tires are tracking on tight turns, as well as what's coming up behind you on an open highway. You simply don't have that range of view with clip-ons. If tiny mirrors were appropriate, you'd see them on trucks and buses.
Full disclosure: I do leave the backup camera on when towing the Jeep with the motorhome. It's nice to know that it's still back there, and I can't see it in the mirrors except on tight turns.