We really liked Quaking Aspen, between Camp Nelson and Ponderosa. Very quiet and cool, at 7000 feet. With that rig, you will have no trouble with Highway 190. Here is a short blog post that may be of help:
Quaking Aspen areaWe have also stayed at Wishon, not far from Camp Nelson, in the winter -- it would be pretty warm in the summer, but the river is right nearby for swimming (in snowmelt -- very refreshing!). Here is a post about that trip:
Wishon areaWhatever you do, don't miss a hike in Freeman Grove -- one of the best groves in the Sierras.
2012 Fun Finder X-139 "Boondock Style" (axle-flipped and extra insulation)
2013 Toyota Tacoma Off-Road (semi-beefy tires and components)
Our trips -- pix and textAbout our trailer"A journey of a thousand miles begins with a single list."