Sent a reply to your PM.
I think from where you are at Verona I would go down I-81 to Natural Bridge and pick up 130 there. Go into NB and you will come up on it. It begins there. Follow it through the valley to Glasgow where it intersects with 501. 501 is OK from Buena Vista but you don't have to go through the town.
Once you intersect 501 you still have to go over Snowden Mountain as 130 and 501 are the same road at this point. It is not a terrible climb by any means so just take your time both up and down the other side and you will be fine. Once you are down the other side, 501 will branch off to the right to Big Island and 130 will continue on. You will only be a couple of miles from the campground.
I forgot to mention in the PM, but another, although slower alternative is to take I-64 to Afton and get on the Blue Ridge Parkway and follow it down to it's intersection with 130. About 63 or so miles but nice if you have the time. Campground is just a mile or so from the parkway.