Many benefits starting with price! Heat, long bed/flat bed.. parts can be hard to find, but they're out there on the www..
4x4 is a must as they stick on wet grass.. check for rust before purchasing as many of these were used in the rice fields before coming over.. plenty of power for us in the hill country and never been stuck in 4 wd.. driving from the right takes some getting use to and they can be uncomfortable for a large person as the cabs are small.. ext cab is the way to go if you can find it. Not sure if I lucked out on fuel economy, but we have a 7 gallon tank and seems to last forever.
Edit: Ramball did the high rack and turned out great!