Me and my partner have been running 21" push mowers for the past two years on residential sized lawns. We are in great need of a larger deck mower that can improve efficiency. 21"s are just too slow on most of our lawns. I've done some reading on the topic, and the general consensus seems to be that a 36" WB is the backbone mower of most commercial companies. We are two 19 years old in our second year of business trying to expand. If any of the experienced members here could give me some valuable insight on what we should do I'd be very thankful. We are looking to buy a real backbone mower here, (used or new), to cut as much grass as possible, and we are hoping to spend no more than 5000. Should we go WB? ZTR? Also, what is better: open or closed trailers. Thanks guys.