This is one of those situations where supposedly the brand new racks have been improved and seem to be pretty reliable (but not cheap). If you plan on hanging onto your truck, it probably makes sense to seek out and bite the bullet on a new Mopar replacement, even if it means waiting a bit. Buying an older used one...might not be a long-term fix.
If you're pretty DIY and mechanically inclined, you could do some de-bugging right away. It might be something simple, like fuses up by the battery, wiring, etc. Those are easy and quick checks you can make. Watch a few Y/T videos. You're not alone. There are a lot of past forum threads on Ram EPS (electronic power steering) racks on this forum worth searching (or Google/Youtube search), which contain other debugging suggestions. Or maybe you've already done those. (??)
Cheers