Hi Appleguy,
Congratulations on your 30c purchase and welcome to the Heartland Family, and to the Heartland Owners Forum. You'll find a lot of useful information here along with a great bunch of people who are willing to share their knowledge and experience.
The ABS Pinbox Cover seems to be standard on Bighorns, but is an option on Landmarks. On the Road Warrior, it isn't listed as either standard or as an option. Curious.
You might have to call Heartland Customer Service at 877-262-8032 to find out. If it's an unlisted option, you may still have time to modify your order.