Is there room on a '04 3.4 to add a second alternator?

I camp out a lot with my truck, and I've been looking at getting a portable fridge. At the same time I'm thinking about getting a roll bar and loading it with mega lights (PIAA, as bright as I can get!)...

And there are other things that I would like to use on trips that require some juice, but I don't wanna blow up the factory alternator...

So you tell me... Should I go with a larger alternator, or stick with factory and add a second (if there is room)...

Thanks!

2004 Tacoma Xtracab 4x4 V6
JL Audio sound system
** Caution: Video camera mounted in grill **
My Mileage