They make a product just for mobile homes, it is called, "Verticle Vinyl Mobile Home Skirting".
It is very easy to install and you will never have to paint it, it won't rot or attract bugs. It comes in solid and vented panels in a few different colors. You will also be able to unlock any of the panels to gain access under the home anywhere you want.
I would check with your local vinyl siding supply house for more information.
Oh, I also agree with Bruce and Steve, get a guard on that mower. That rock might be aimed at you or a pet or neighbor!