Looking at the rear pic, you need to consider that there is/has been water infiltration. Ours had serious rot there and you could not even see the separation of the bumper to the frame and thats what this one looks like it has. I fixed it now, time consuming and a steep learning curve but I only paid 3.5k for ours (still too much, I believe) and expected this would be the case.
Contrast with this one I just saw on Kijiji Airstream Argosy 28' - Calgary Travel Trailers, Campers For Sale - Kijiji Calgary Canada.
He is ASKING 3k Canadian (= 6cents US doesn't it?
) fully equipped apparently.
I know you are not into making the trip to Alberta but I guess the point is there are others, for less, fully equipped (but you know that). In fact, Okotoks is way closer to the US border than the last one I posted you