If I had the cash, I would go for the $18000 white B2, everything looks original except the master cyl. I rather have that for $18k then a Maverick for $24k.
That being said, I searched for a better and closer option for you, I searched over 30 of my local CL, and I came up with this one. I think it ticks all the boxes (not a rusted heap) for you and is ready to drive, with a lot of PM items taken care of my the owner:
1987 Ford Bronco II - $14,900
I bought in June for one of my teenage sons to drive but it is not practical for an inexperienced driver. It's in great shape for the age of the vehicle and can be a daily driver. Carfax shows no...
bham.craigslist.org
650 mile - 10 hour trip from your area, but, you could probably drive it back. If it passes that test, it certainly would be ready for the Mexico trip. Not too crazy about the auto hubs and electronic transfer case, the cracked dash is a minor thing and easily replaced. The seats look original and in good condition.