There are alternatives to owning a tractor yourself. Finding a group of people who would use the tractor is feasible. Setup a democratic system to control the use of the tractor and a system of dues to ensure it is well maintained. Basically treat the tractor as a commons that people can exploit in an ethical manner.
This kind of system can be expanded to all means of production in theory. All capital treated as commons for workers to use.
This has the added benefit of being feasible within the current system, makes it easier for workers to survive, and acting as material evidence for alternative economic systems.