Just got back friday night from that exact trip. 4 days 1820 miles. 4 adults and an 8 month old.
I rented a suburban and we all had a great time. Stayed in hotels 2 nights and camped in tents 1.

Saw the sand dunes, mesa verde, grand canyon, canyonlands, and arches national parks.
Camped in canyonlands which was really cool.

Also saw 4 corners. $3 a person and its on the indian reservation

Buy aannual pass. It will pay for itself.

Ill post more tomorrow. Got to sleep!