From quick scaling and measuring is somwhere between 40-60,000 sqft of pavement. You should be able to do that with your set up no problem in my opinion. My question would be more on your experiance and knowledge with plowing a bigger commercial site. Hw qualified are you to do it? On the same note everyone has to start somewhere.
My next question is what happned to the last guy? You said you talked to him about it? Did he quit? Are you bidding against him? Why is he answering your questions if he is still in the picture at all?