I've found that BWV usually preassigns rooms. My last time at BWV we got standard room 3002 which is down near Jellyrolls, as far as possible from the bus stop (we did check-in around 1:00 but our room was not ready). We had requested 3123, which is above the pond in front. If you get a low # (last 3 digits), ask if anything else is available if you want to be close to the entrance and bus stop.
When we stayed at OKW last month, we did not arrive until about 8:00pm and we did not get a great room, I don't believe they pre-assigned because the cm was searching her computer looking for a room.