I have been wanting to add a third quad to my stable. When the "kids" visit the farm we have four adults and two teens, plus possible boy friend/girl friend for each teen. Another quad would help a little.
Ended up buying a new riding mower instead. I have 60 acres. I brush hog about 5 acres and mow about 3 acres. The rest is woods with a stock tank and creek.
I want to increase the area I mow with the riding mower. My little mower couldn't cut it, so I bought a 54 mower with 26 HP and a 54" cut.
I really like new stuff. The new mower works great and cuts down on mowing time a great deal.