There was plenty of space for my short bus and it was close to a lot of OHV/mountain biking trails. The BLM backs up to Arches NP. I camped here for 2 weeks and met quite an assortment of people from all over with tons of different hobbies. Would come here again in a heartbeat.
It’s about 2 miles down from a convenient store and 12 minutes out from town (I’m sure if you drive a smaller rig, it’s under 10 minutes).
After entering, the dirt road to the right takes you to camping in front of the Mexican Hat there’s quite a few spots that are big rig friendly. The first road to the left I’d advise for slightly smaller rigs, but I took my short bus down there just fine. Down the hill there’s Mexican Hat Rd which seems to stretch forever. A wide variety of spots and all a close walk to the river. There’s also a dirt road that veers down - I’d only recommend for 4x4 high clearance vehicles, and probably not if it’s too wet. If you follow that road all the way down there’s actually a white sand beach to play in the water.