Of course it's possible to drive all over Central America without fancy 4x4 gear. The locals do it all the time. You have to purposely choose a more difficult route to find yourself fording 4 foot deep streams or traversing boulder fields. That said, it's useful to have high clearance and a short rear overhang to simplify getting on and off small ferries. 4x4 can be useful to get you unstuck from sand at the beach or the side of a muddy road. And you can make instant friends by helping a fellow traveler get back on the road.
If you're traveling with a single vehicle, you will probably want to take some simple self-recovery tools, like a shovel, high lift jack, and hand powered winch and cable. One example of a hand powered winch is described here
http://www.expeditionswest.com/equipment/general_equipment/black_rat_winch.htm
The come-along is cheaper and lighter than an electric winch, and it can be attached to either end of your vehicle.
With a pair of vehicles, you'll be able to rescue each other when you get stuck. Perhaps more important, the second vehicle can go for help if the first vehicle becomes disabled for some reason.
Chip Haven
If you're traveling with a single vehicle, you will probably want to take some simple self-recovery tools, like a shovel, high lift jack, and hand powered winch and cable. One example of a hand powered winch is described here
http://www.expeditionswest.com/equipment/general_equipment/black_rat_winch.htm
The come-along is cheaper and lighter than an electric winch, and it can be attached to either end of your vehicle.
With a pair of vehicles, you'll be able to rescue each other when you get stuck. Perhaps more important, the second vehicle can go for help if the first vehicle becomes disabled for some reason.
Chip Haven