We were just there and were in loop 2800. I had similar concerns as you and called a few days before we were to arrive. I liked our location and would like staying in that loop again. We were in cabin 2813. It was on the inside but still very quiet and out the back it was still all trees. The loop is big and the inside is all treed. That said, I still would have preferred to be on the outer side so we could have more easily cut through the woods to the Outpost (we didn't have a golf cart). The cabins really do seem to all be lined up so they have the same distance between them, but they are SO quiet. We literally didn't hear anything outside our cabin at all - not one single time.
While using the internal bus, we could see that many cabins back up to the road. We could also see that some areas don't seem to have trees in between the cabins. When I called, I specifically requested a cabin that was in more of a treed area and that backed up to a lot of trees, not one that backed up to a road, other cabins, or an RV site.