I'm not sure what mods you are planning or what the focus of your trip is. Here is some general food for thought. Whatever you do keep your mods under the hood/under the rig so to speak. As it is the rig will blend in nicely with everything else on the roads around here...that's a very good thing. The things that I would suggest right off, get your windows tinted as dark as is legally possible where you are. Look into getting the all of the doors and fuel door re-keyed with better than OEM locks. I went by a trusted local locksmith after my rig was broken into twice with OEM locks. They put a set of "the good German"locks on there and no worries since. They are much beefier and hard to get pry tools under the cylinder edge or into the key hole. Get a very good burglar alarm. The kill switch is not a bad idea. Not that the burglar alarm will stop a serious thief but most guys will not want to mess with the rig if they can't casually glance and see what's worth stealing on the inside, they have to work through non standard locks and assuming that they decide to go for it anyway, all the while that they are breaking in, the rig is screaming, waking up neighbors and causing folks to look.
If you are at all planning on driving on the roads in Centam or South America at night, highly not recommended, you will need a very good set of driving lights, i.e. something much better than the standard low/high beams. The best highways here are almost always come with cows, horses, drunks and dogs as pop up target accessories.

Unless you are on off road challenge race or some deep jungle expedition you will not be driving off road at night anywhere south of Texas on this trip, just not safe from either a crime perspective or seeing terrain features perspective so I would forget getting some huge rack of roof lights and focus on some bumper mounted driving lights and maybe a decent work light aimed out back. Most guys here have swapped out the standard H4 bulbs for the one of the higher wattage versions and added drive lighting.
I would recommend against a roof rack full of stuff. It just invites eyes and makes the thieves "hungry" as they say here. An additional consideration is if you are planning to go in or out of parking garages and have more than a 2 inch lift, a roof rack full of stuff will be more of a headache than a convenience.
Since you mentioned a winch, and for the same reasons as I mentioned about the pop up cows and drunks, I would highly recommend a good bullbar bumper where the winch can be mounted mostly out of sight inside the bumper.
I hope that this helps.
