In your prior posting on the subject of mowers, I commented on my having a Bush Hog 10' single wing batwing. (BH3710) They're quite common in the highway right-of-way mowing industry. In fact, they're IDEAL for that task. Bush Hog and Rhino sell quite a few of that style mower, as does several other players in the industry. I plan on adding AT LEAST one more simular mower next season if all my existing contracts fall in line for the upcoming season.
When looking at a used batwing, check the obvious, like PTO shaft condition, gearbox condition, bearings (for play) seals, ect. Also, check the deck hinge. You'd be amazed at how much abuse that part takes. If the mower LOOKS battered, it probably was. Buying from a municipality/highway dept, those mowers most likely saw extensive use. In MOST cases, they also receive excellent maintenance, so they may be in great shape.....or not.