I checked with Roadmaster and since your 2018 Jayco Redhawk SE 22c was built on a 4500 Chevy chassis you will need the RM Reflex Steering Stabilizer w Mount Brackets for Class C M item # RM-RBK23-RSSC. This fits the 4500 cutaways.
I have linked an installation video below so you can see how to get it set up. view full answer...