I was able to get my 40' toyhauler up to one of the top spots...it was a bit hairy but did it. Be ready to level your rig, not many are very level.

Absolutely. I've seen every type of RV parked in various locations. Smaller setups will definitely have more spot options.

Spme sites are more accessible than others. A big rig? Probably not. A small rig with good ground clearance, yes.

The road up to the sites is paved with a decent grade. The turns are about 20mph. The area is frequented by all size rigs so it would depend on how comfortable you are with taking your RV off road. I took my 32ft 5th wheel there with no issues but was careful of uneven road.