I also looked at PTO generators. Have some nice things like one engine to maintain. But, do you really want to run your tractor at PTO speed for up to a week in an outage. Also, you usually lose power in a storm. I like to have my tractor available for cleanup or snow removal, not powering my house.
On the other hand, might provide one of those rare opportunities to convince SWMBO that a second tractor is a must-have rather than an unnecessary luxury!