Typically Toyota's hybrid systems run on a ~276v system and not useable for powering equipment.
What you are suggesting would be great but it's not on Toyota's radar.
Thanks Mike for that - too bad, missed opportunity, but I also know that it would be like the Pontiac Aztec and the tent that mounted to the back: a gimmick that only a few people would actually find useful! So, good reason not to go for it (disappointing as that might be!)