In 2013, either last week of May or first week of June, I drove a 30-foot rented Class C to the end of the road to Angel's Window. I've driven that road a few times over the years and don't recall any reason I wouldn't do it again.
It is narrow at times, and tree branches can hang close to or over edge of road, but with care it's not bad.
Unless they have added RV restrictions since my latest visit, I would recommend driving it to see Angel's Window. There are other points of interest/view along way also, but my favorite is the overlook at end.
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