The park I went to this last weekend and often frequent had a county highway leading to it that is a very narrow road. There is no shoulder. About 6 inches of grass and then a steep ditch.
You have to hope the other person is not drifting into your lane. I do think about it when meeting a another camper, semi, or farm tractor but, there is nothing I can do about it.
I've been driving on it for 37 years and I have never heard of anyone having a problem.
I do wish it had a few feet of shoulder. It would make me feel better. No chance of that happening in my lifetime though.