We are currently at Yosemite Pines. Pads are dirt and gravel, so you may have to level your rig. Haven't used the bath house and won't so can't give you any feedback there. WiFi works well and is included in the cost. Bring a patio rug to cut down on dragging dirt into your rig. Plan on it taking at least 1 hr and 20 minutes to get into the park.
There is a 1,000 Trails closer to the Yosemite. We drove thru it yesterday. Non-members are put into pretty crappy looking sites, close too.
RE" Priest Grade: There is a 7,000lb weight restriction on the grade. The front desk told us the CHP pretty actively tickets violators. I really wouldn't recommend taking it if you are towing, or are in a Class A or Class C. HWY 120 is steep, with beacoup curves. I think the speed limit is 35 MPH.
If you are considering cutting across from Oakhurst on HWY 49 reconsider. We did it hauling a 36 foot 5'er. The last 23 miles are a real bitch and not recommended for any combined length of 30 foot or longer. If you take it, it will be a real white knuckle, E-Ticket ride!