wheel spacers ?

could i use wheel spacers to get that wide tire look? how safe are they? how wide would i need to go? where is the best place to get them?
i have a 2000 silverado 1500 ext. cab 4x4 w/285/75/16 nitto terra grapplers on 8 inch wide rims.

STAY AWAY FROM WHEEL SPACERS!!! Unless you would like your tires coming off at any moment. Although some people have had decent luck with them, but I have heard horror stories too. I have some Amp Flatheads that I could sell you. They are 20x10's that have a one inch offset that throws them out further. www.ampwheels.com then click on the flathead.