From the above link the owners make a point that they have a smaller, less cost, less add on costs, less amenities, well run with nice neighbors, etc than many parks in the area.
I would have though that they would be more accommodating for the OP. However their website suggests they are normally full this time of the year so perhaps they are more picky in the winter?
Besides they are from Alaska so they might have a different perspective on their park. I'm not saying anything negative about someone from Alaska but we found them to be very hardy, independent and friendly which was only one reason that our 2013 once in a life time trip turned into an adventure and we're going back!
I like the OP am surprised at the response he got.