There are any number of do-it-yourself roll on or spray on bed liner products available. Duplicolor has one, and Line-X has one, as well as many others. I agree with the other folks: Lizard skin, then a bed liner type product over it. Pull out the seats and do the whole inside floor and kick panels and door bottoms up about a foot at least. When it gets dirty, just hose it out and let it dry.