Well a Four can be easier to locate than a Six! And with the photos posted, looks like they will be needed for a Stagecoach going down the road. Fit and sound is probably part of the picture with a Stagecoach.
I would really like to see what a Stagecoach rides like when it is moving along. According to some historical diaries, you could get seasick from the rocking motion. I would want to AVOID the seasick part, just enjoy the ride.
Sure is interesting that they posted an ad on Craigslist! Everyone searches and requests things wanted, on Craigslist these days!