yes you can, i have a saturn and ive done it,
you need the ratchet tiedowns put the boxspring on first then the mattress,
you going to open all doors run the tie downs around the bed and through the car, make sure there goods and snug. close your doors ans away you go.
when i do that i keep my hand on the strap in the inside of the car, if my cargo should move i would fell it
http://www.etrailer.com/merchant2/gr...410_2_1000.jpg