I have been looking around for an air conditioning unit in my '52 gmc. I looked at the Vintage Air units and a couple of others too. I have couple of questions.

1. The standard units are made for pickups (a small cab) and are they able to keep the carryall cool?
2. They can be used with 6 cylinders, but do I have to run an alternator? (I have a 12v generator)
3. Is there a double pulley available that I can use?
4. How about the units that use the speaker grill, do they work well?

Any help is appreciated. -Tony