Food for thought
So some things to consider--you should have no trouble getting food, fuel, and supplies. Campgrounds will most likely be open, though there may still be reduced capacity issues.
Here is what I would consider--is this your first time to these sights and parks and are you likely to do theses sights and parks again? It may well be that ranger guided tours, visitor centers, and sights and park activities will be curtailed or eliminated even in September. Will you feel a little cheated on the whole experience if you can't see or do some of the things you were looking forward to seeing and doing? Will your relatives and friends be comfortable visiting with you under Covid circumstances? As a member of an at risk class, will you be comfortable with a 6 week trip and multiple possibilities of exposure (while an RV is the ultimate in social distancing, that applies best if you don't leave it!) Covid will remain a risk until we have a vaccine and enough people have been vaccinated for herd immunity--that will not happen by September. So only you can weigh the pros and cons for your circumstances and comfort level.
Best of luck to you whatever you decide.
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