The KOA in Midpines fits long RVs, and it's on the YARTS route so you can pay to ride into the Valley (an hour away.) Yosemite Pines RV resort has large sites as well. (Read reviews of these places to see if they suit you. I don't have any first hand knowledge of them.) Another RVer shared these ideas: www.rv-clubs.us/rv_campgrounds.html www.rvparkhunter.com www.rvparkreviews.com cby NacciNW - Yosemite and the Sierra Nevada. News & Discussion
There is some info and a map of Mariposa Grove on the National Park Service website: Mariposa Grove It's about 2 miles from the South Entrance to the MG parking lot, and it's highly likely that this road will be closed but walkable. We were in Yosemite in early April 2009. One day it was about 70° and sunny, and the next day it was spitting snow. Expect anything. One more lodging ideby NacciNW - Yosemite and the Sierra Nevada. News & Discussion
Newbie here myself, but I have a tiny bit of additional advice. Valley campsites book up in about 3 - 5 minutes of becoming available. If your arrival day for camping is May 1-14, the reservation day is Dec 15. If your arrival day is May 15-31, the reservation day is Jan 15. Practice making reservations before the actual reservation day. On the 15th (of the appropriate month), just beforeby NacciNW - Yosemite and the Sierra Nevada. News & Discussion