The reality is that just about any business can be a "job," and it has more to do with the size and organizational structure of the business you're buying than it does with the type of business it is.
I've worked on several FedEx line haul business transactions, and there was only one of those where the owner ever got behind the wheel. So in my first-hand experience, these businesses can be absolutely perfect for an owner who wants to manage an operation, rather than pull a trailer over the road.
With that said, they are demanding businesses and require an owner's oversight and attention - CDL drivers are a tough group to manage, FedEx has some strict guidelines you have to adhere to, and equipment is expensive and requires constant maintenance/service.
But overall, I've found these to be excellent business opportunities.
I will make one qualifying statement here, however - most of these posts don't designate whether the subject business was a line haul operation or home delivery operation, and that makes a huge difference. The general opinion amongst FedEx contractors that I know is that home delivery is much tougher, time-consuming and frustrating business to own, with much less upside and much more capital requirement to scale.
My experience has been strictly with line haul businesses.