Wanted: Roadtrip Van That Sleeps 4

I am looking for a reliable van or camper than can sleep 4 adults for a long cross-country road trip this summer. Those are the basic requirements, although of course additional amenities such as storage, a cooktop, etc would be wonderful.

I am interested in purchasing or renting for 2-3 months (July through mid-September, probably). Please respond with vehicle description and suggested prices (the posting made us put a price in, but we open to discussion). Thank you!