We have been there twice, but not with our Scamp, the north route was better when we went last, the route we went in the first time is now closed, but is still on some maps as the way in, you can get directions from the NPS web site. Much of the "dirt" road is wash-board as others have mentioned, some of it which is sandy more than gravel can be fairly smooth. It might get a little hairly if right after rain, however, we left not long after a rain and had no trouble on leaving. The first time we had a cabover camper in the back of a pickup. The second was in a 20' Komfort lite TT with dual axles. We have not tried the Scamp on it. I would like to go back and enjoy it again. If you happen to be driving the road and you get to water crossing the road, do not try and drive through it. Running washes or arroyos can be very dangerous. Just wait on higher ground and it will be over in a little while. Seems like there is 13 miles of dirt, it is paved as you get in the park and on the first section off US 550.
Chaco Canyon is located in northwestern New Mexico. The preferred and recommended access route to the park is from the north, via US 550 (formerly NM 44) and County Road (CR) 7900, and CR 7950.
From the north, turn off US 550 at CR 7900--3 miles southeast of Nageezi and approximately 50 miles west of Cuba (at mile 112.5). This route is clearly signed from US 550 to the park boundary (21 miles). The route includes 8 miles of paved road (CR 7900) and 13 miles of rough dirt road (CR7950).
http://www.nps.gov/chcu/planyourvisit/directions.htm
Spring and
Fall are great times to visit with more moderate temperatures, but unexpected storms can change things dramatically. Monitor local weather forecasts. By Phone: Visitor Information (505) 786-7014
I am not sure if the area code changed for that part of NM, but the 505 should work until next year even if it has changed to the 575 one.
Chaco is located at 6,200 feet in elevation. The weather in Chaco Canyon is unpredictable and can be extreme. Come prepared for all possibilites!
When hiking the canyon, be prepared for heat, rain, wind, and unexpected changes in temperature. Carry a rain poncho and a jacket or sweater. Wear hiking boots and a wide-brimmed hat, and use sunscreen. Carry and drink extra water. Eat lots of snacks. Take your time adjusting to the altitude and don't overdo.
http://www.nps.gov/chcu/planyourvisit/weather.htm