Link to my blog post on Ram options.
Spare tire air sensor: Here’s one you might not think about. Read it in a blog where they had a flat tire which they changed out. While heading down the road the tire air monitor was still able to sense the tire that had a leak in it, even when not mounted on the truck. The spare tire did not come with a sensor, apparently being an option only available in higher end trucks.
Ram active air: Apparently this has to do with getting more air to the engine.