I know there have been a number of questions in regards to finding a code for DirecTV remotes and the Furrion TV's and was asked the same question by a neighbor here in our campground this morning that has a 2016 Pinnacle and a 50" Furrion in his rig.
Since these older style remotes (RC6x) won't "auto program" like the newer RC7x remotes do, and with Furrion or LG not being listed in many DirecTV receivers such as the older D12 SD receiver, you have to manually program them.
After a little digging online, I discovered a code that worked with my neighbors Furrion and thought I would pass it along as well as how to do it.
1. Move the selector switch on the DirecTV universal remote to "TV".
2. Make sure the receiver and the TV are already turned on.
3. Press and hold the Mute and Select buttons on the remote until the green light at the top flashes twice.
4. Enter the code 10056, and then press the Power button.
If the TV turns off, your good.
HTH
Edit: I found this DirecTV document that lists the 10056 code as a "Concerto" code?!?!?
https://www.google.com/url?sa=t&rct=...45822982,d.eWE