I have a 12v cigarette lighter powered battery charger for my millwaukee tools in my pickup.  I would go that route for charging batteries rather than a generator.  I have a 12v air compressor that I want to mount under the hood for blowing up tires/small air uses.  It is not a service truck by any means, just a well stocked pickup that will do 95% of my repairs without running to the shop for tools. 

We also use a gas powered leaf blower to blow off the combines.