King Road is not an 'exit", it's just a road. Heading south from Quartzsite it's just before the Border Patrol check point. Roads there are all flat gravel roads. Just look at the picture for the listing. Accessible for any size rig.

It’s marked as King Road. It’s just north of the Boarder Patrol checkpoint. It’s a pretty well maintained dirt road and the sites are easy to access on either side of the road.

No, Crystal Hill is the northernmost entrance to Kofa. King road is further south on Hwy 95, measuring 30 miles from the town of Quartzsite.