Seems rather odd, BUT not disrespectful if the ride stays on the main thoroughfare and does not trounce into the grass near graves. I think if the people arent getting wild, being loud, and acting stupid, it should be just fine. No reason to be 100% solemn in a graveyard.
Probably not. Because it is parklike, people walk and job on the paths during the day. The folks on the hayride were very low key, so no behavior problems. It just seemed an odd thing to do in a cemetary, on Memorial Day.