I didn't even read the 40-60 lawns part.
DO YOU ALREADY HAVE THE LAWNS? or do you think you can get those lawns?
Because anyone who is mowing more than 15 lawns is going to have upgraded to a mower larger than 21/22" so that they are making more money and saving themselves time.
There is an Old Blue Chair for each and every one of us, we just have to find it.
2006 GMC Sierra 2500hd crew cab
BOSS 8'2" Power V
Hustler X-one 60"
Toro Proline 36" wb w/t-bar controls
JS46 22" walk-behind (wouldn't recommend)
Shindaiwa T254, Echo trimmers, chainsaws, pole hedge trimmer, pole saw, hedge trimmer
Shindaiwa 633 and Husqvarna 130BT blower