The key is to finding one you can own. Most beer routes are owned by a bigger company, the drivers I know make 6 figures but work too much, this tells me that the owner makes much more

Buy a pre established distribution route, run it yourself for 6 months then hire a contractor to run it for you but pay them half of what you bring in. Turns out to be about 50k a year profit and that’s after all expenses. Not many other investments that can bring in 50% in the first year and every year after. Just requires you to hustle for the first few months.