Well, some alternatives with their pros and cons could be:
1. A farm pto genny but hooked to an old cheap small vehicle engine iso a tractor. would be a HD diy solution. Could support a small farm until the fuel is gone.
2. Get a high output alternator to your truck, put in a max size battery, a new HO charge controller adn engine rev control, new thumb-thick wiring and an inverter. Say your alternator will -net- out 100 amps at 14 volts, you would get continuous 1kw out including surge capacity from battery. You could also use it on work sites with engine off to say charge things, lights etc. True sine inverters are expensive but if you need them....
Or get a small diesel genny on wheels. Not as interesting but...