Honestly other than maybe a bit of cool factor there wouldnt be much benefit to doing it. I mean anything is possible. It all depends on how bad you want to get it done. Lay under the vehicle and take a look, try to look where the routing would go and what you would have to work around to do it.
If it were me I would want some type of crossover or x-pipe in there to equalize the exhaust on each side. That alone can create some space and routing issues, especially on a 4wd (front drive shaft, t-case and trans clearance to think about).
I don't see a big performance advantage unless you have a hopped up 6 cylinder. You could get a nice performance gain just from bumping up the size of the single exhaust and adding a good flowing muffler. Which brings up another option, you can route your exhaust into a single in, dual out and then have a dual setup that way.
If you really want true duals, you can do it, just get creative.
If it wont go...force it.