Geese weed eaters

I have a small plan to make some extra money on the side with geese. I was thinking of building a small coop ontop of a small trailer and tractor geese around people's yards to mow the weeds. ( I have a lot more details planned out witch would take pages to write however) I plan to have some portable electric fencing to keep them out of certain areas ext.. My question is, how many geese would it take to mow weeds compared to one person pulling weeds? Example, if a person is paying someone $10 an hour or whatever, how many geese would it take to do the same job in the same amount of time. ( I have also thought about goats too, but I want to try my chances with geese first.)
Thank you
Trent

I free range my geese so I cant really give you an exact answer. From experience with chickens however I can say that much of that is going to depend not only on How many geese - but how densely they are stocked. How big a space are you planning to put them in and for how long? Just a tractor? you mentioned a portable fence too. Also weather you are using full grown geese or young geese will effect how much they eat in a go.

Geese have preferences, like grassy things and soft tender things, but they are not commitments. They can't tell if something is a weed or not. So you will have the best luck placing them where an entire area is to be "mown" such as a lawn, or an annual garden at "end of season" when there's nothing of human use out there.
In general they do not like coarse, tough, hairy, woody plants or anything out of their reach. So they are often recommended to pick grassy sprouts and weed seedlings out of something like strawberries or tomatoes. But if there are too many geese in a given area for too long they will finish these off and then start on the plants. And they will definitely go after fruit, especially once it is turning color.