After a lot of trial and error, figured out the easiest way how to get a discount code. You do not have to make an account as that doesn't change anything.
1. In chrome incognito mode, go to ramtrucks.com
2. Select "Build and price" then click on RAM 1500
3. Select any model, I tried different 1500 models and don't think it made a difference. Better luck going Rebel vs RHO but it might just be luck
4. Scroll down to the summary section, you can select different options if you like but don't think it matters
5. By the time you get to the bottom you should get a pop up with either "SIGN UP FOR UPDATES" or "GET YOUR PRIVATE OFFER"
6. If you get the "SIGN UP FOR UPDATES" popup then close the browser and start back from step 1
7. It can take several attempt but at some point you will get "GET YOUR PRIVATE OFFER" and just need to fill in your details and email
There are apparently a certain number of codes per day time but just keep trying and you will get a code.
Hope that help someone
PS The code expires in 30 days and if RAM doesn't make their estimate delivery date, ask me how I know, and you have to get another code.
I had to use a different email address as I had gotten a discount code previously. When I put the same email address, I did not get a 2nd code. However, I did the process again got a new code using a different email address