Any intel on the first 7 miles of Death Valley Rd. from Ubehebe Crater area?

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To close the loop on this -- I found the beginning stretch of Death Valley Rd. very bumpy last week, so I decided to turn back after a short distance in the rental car. I think someone with a higher risk threshold and more patience could do it though and make it in the first few miles. I even had a patch kit, tire pump, and fix-a-flat.

More on this adventure coming soon.