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Loads of great examples here. I have just ordered a hydraulic table myself, in my wife's name as she will sign for it. 
I used to do a lot of stuff with cranes and handling aids for my job, both design and use.
Generally its worth remembering that if its too heavy to lift its dangerous so buy bits and equipment that does the job, don't see how little metal you can use, use chunky stuff that fits the hand and survives errors. Its cheap, why not?
Secondly it needs to be held down in the car as well as a person, that means big bolts and brackets. Someone decided to broadside my car once and it shunted everything, its not about you driving carefully.