Seems a little high for a 2012 unit. If it was a car, I would think it was high. You can find tons of 2012 units with just a few thousand miles. Was there anything particular with this unit that caught your eye?
Gas engines can go several hundred thousand miles with normal maintenance. If this unit is 'the one', check the maintenance history, etc. Go over it with a fine tooth comb, if it checks out to your liking and the price is right, you might be going camping next weekend!
MM.