I usually recommend staying outside of both Yosemite & Seqouia, using a dinghy to visit them. Looks like your coach is a 28'er. We visited both parks in a 26'er without a dinghy a couple of decades back without reservations & had no problems. Reservations at the park campgrounds seem to be done way ahead of time by most people, but you are coming in after the summer season. Perhaps others with more experience in this area can provide insight. Seqouia is spectacular. (We always lunch at the lodge.). But there is a tremendous amount to see between there & Reno. Yosemite. Tahoe. Donner Pass. (A great place for a quick meal. Sorry.) A beautiful drive, doable in a motorhome if you really want to give it a workout, is Tioga Pass from 395 over the Sierra. If you head down 395 then come around through Bakersfield, the June Lake loop, Mammoth, & Lone Pine are great places to visit. I find the Eastern Sierra just gorgeous. As suggested, if you have the time, take it. We stayed at Sparks Marina RV, our last visit to the Reno area. If you aren't familiar with the various RV park review sites to help in your travels, these are the ones I use. rvparkreviews, campendium, rvparky (that's an app), tripadvisor & yelp. These will really help zero in on the experience you want. And finally. If you haven't been to Yosemite, it's a must. Two main ways in. Coming up from Fresno, you'll have more of a climb. You'll go through a tunnel. Very carefully cross the traffic to the the pullout vista point. This lets you see the geology that makes Yosemite so special. If you want to venture on to nearby Hetch Hetchy, you can see what Yosemite would look like as a lake.