The package of Air Tabs included enough tabs to install them on both sides of my coach, as well as across the roof. I did have to get on the roof to do this but it was easy enough to accomplish. I also had enough left over to install them in front of the wheel wells on the rear duals.
These were purchased to improve the handling, especially during windy conditions and from passing trucks. As an added feature, they keep the rear of the coach and my toad cleaner. I did not expect a return on my investment just like I did not expect to get my money back from Koni shocks or my Blue Ox steering stabilizer.
Money spent to make the coach more enjoyable to drive is an investment in my own comfort.