Abercrombie Rd and Bonang Rd

"Abercrombie Rd south from Oberon towards Goulburn"

It's a while since I have travelled both of the roads you are enquiring about. I don't remember much gravel along this road. I believe there is none now. It's a favoured route to tow vans between Canberra and Lithgow and the Blue Mountains.

"Bonang Rd north from Orbost towards Delegate"

Again it is a good road but a little narrow for a few kilometres. The road up to the McKillops bridge turnoff is a full 2 lanes wide. Take the narrow sections around Bonang cautiously so you and the horse trucks can dodge each other. Delegate to Bombala

The road from Oberon to Goulburn has been sealed for a long time. Nice overnight at either Black Springs or at the river.

Thanks guys
I thought some of Google's imagery was a bit dated. Thanks for the update.
KO

I'm coming in a bit late here, but for what it is worth. I used to live near Delegate and drove the Delegate to Orbost road countless times over the decades, including with semi trailers. It is a good road. Still gravel between Bonang and the settlement of Goongerah. There are a couple of spots between Goongerah and Orbost which are a little narrow, but semi trailers use this road all the time. No worries with a van.