Hi!
Here are a few ideas and I also included places to sleeping in your car.

CAMPGROUNDS AND CABINS

-Camprounds and RV Parks : http://www.campusa.com/

-Campgrounds directory :
http://www.gocampingamerica.com/main.html

-The Campground Network : http://www.the-campground-network.com/

-KOA Camprounds directory (usually between 20-35$): www.koa.com

-National Parks, National Monuments and State Parks : http://freespace.virgin.net/john.cletheroe/usa_can/natparks/index.htm

-Bureau of Land Management campgrounds (usually between 5-12$) : http://camping.about.com/cs/campgrounds/a/public05.htm

FREE CAMPING/SLEEPING IN THE CAR (in other words if you like adventure):

-www.webspawner.com/users/oa389/

-www.webspawner.com/users/q389

-www.webspawner.com/users/t389

-www.webspawner.com/users/turner39

-www.freecampgrounds.com

-www.geocities.com/desert_dutch/

-Strange places : www.sleepinginairports.net/strange.htm

-Long term visitors areas :

www.telusplanet.net/public/waters/blm.htm

TRUCK STOPS

**Don't forget to ask for a free directory it's always practical to have it on the road.

-Flying J : www.flyingj.com

-TA Travel Centers : www.tatravelcenters.com

-NATSN : www.natsn.com

-Pacific Custom Brokers : www.pcb.ca

Gen:-)