Tioga Pass (Hwy 120) that crosses through upper Yosemite is a beautiful drive and has some climbs, twists and turns but is doable in a 40'. Hwy 140 that goes south off of 120 into Yosemite Valley has a tunnel that you need to verify clearance for your coach. We drove all of this on our motorcycles and Jeep last September but stayed in Mariposa. Be prepared for heavy traffic into Yosemite just about any time.
2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previously '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing