DO NOT buy outdoor carpeting. As previously mentioned, it will never dry; it will be difficult to clean; and it will never stay clean.
When I bought my Bullet last year, I invested in 1 large (20 ft x 8 ft) polypropylene mat for under th 20 foot awning. Prices vary significantly on these larger sized mats. I found a vendor on eBay who had a variety of colors available for around $69. Doing a search now, pricing is even better on Amazon:
Reversible Outdoor Mat . Over 40 days camping last year and unfolding it at least that many times, it still looks new. As a bonus, folded up the way it is shipped (accordion style) will allow it to be stowed on the top shelf of your Passport's outdoor kitchen compartment.