So I don't want to break any rules and I am not sure about cross posting to other vendors.
I was looking at Harbor Freight Tools (internet search if you are not aware of them) and found a section in the Automotive and Motorcycle section called Truck Cranes
They have 2 models available
and
I have no experience with them or any endorsement. They look fairly ... simple and if you don't have access to this vendor in your area then a modification of a generic engine hoist and a hand winch should get you 90% there. I would believe any competent builder should be able to hack/weld something together using these as guides. In the UK a machine mart variety of similar components would also be available. In Germany... I have no guidance. However these units are fairly affordable at ~ $100-150, I don't think building one would be much more or less expensive.