Hi,
Yes it will be much more enjoyable in November to March. However it is do-able, say you want to go south on 395, then cut across to Las Vegas via Death Valley instead of taking 395 to highway 58, then to Barsto, then to Las Vegas, about 100 miles farther. If you keep the rooftop A/C on all the time via generator, and run the dash air too, you might be fine. Personally I would go the long way, but it might be nearly as hot anyway, check
Weather.comIf you will be taking 395 south anyway, then consider that California will have extreme high gas prices as you leave Carson City and go south, until you get past Lone Pine. Line pine is probably 20 cents a gallon less than Bishop, while Bishop will be about 60 cents a gallon more than Carson City, with the Costco at the corner of highway 395 and 50 being the low price in that area.
I would recommend staying the night at June Lake area, or some of the campgrounds near 395 and highway 120 that goes into Yosemite. They will be at a higher elevation, and cooler. I have taken my 97 Bounder with 460" engine over all these passes, and it runs fine. Make sure that you have washed the radiator, so that it is clean on the outside.
If you are in Death Valley, and nighttime temperatures are above 90F, then consider you will not be able to "Explore" much of the valley, just stay pretty much inside the RV or visitor's centers. Not many hikes, ect. So yes avoid it. But check with weather.com and see what they expect during your trip. You might find Barsto is about the same temp, and saving that 100 miles extra drive might be worthwhile.
Class A is much better than a car towing a trailer. You can run the generator and rooftop A/C. No going into a hot trailer after a long drive. Class C has the feet closer to the exhaust manifolds, so not as good as a class A. I put 1/2" thick foam down on top of my carpets, and that seems to help a bit with the engine heat. I found the foam play blocks at Toys R Us.
Good luck,
Fred.
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