For two different truck owners, we drove their trucks while they stayed home for health reasons. They were not running fleets, just their own trucks that they normally drove themselves.
They both had previous experience as fleet owners years ago, and both had given it up as more trouble than it was worth. But their fleet owner experience made it relatively easy for them to put a team in their truck. They did not have a lot of questions about how to do it.
The good news for both of them was they had a team (us) that took very good care of their equipment and made money too. With their share of the revenue, they were able to keep up on their truck payments and maintenance, and have a little extra too. They also maintained their connection with FedEx, making it easier for them to get back on the road when they were ready.
That was a temporary situation for them. If this was a permenant situation for you, using just one truck and one team, your personal needs would need to be quite modest to make a living off the truck.
The risks are higher too. If that one truck goes down and produces an unexpected major expense, you won't have revenue coming in from other trucks, like multi-truck fleet owners do, to smooth out your cash flow. If you are not able to quickly complete a major repair, your team may be off to another truck.
If you end up with a marginal team or one that abuses the truck, your troubles could grow.