How are you getting that through 36" gates?
What is the most common size properties in your area?
How open are these properties?
A 48" maybe a better fit. A 54", closer to a 60" and should get through a 5' gate.
Takes time to build a route. And working PT, you finance a mower and all your income may go to paying off your mower. Meaning first three years you will not draw a salary.