Timing Belt vs. Chain

Ok why does the 1st gen Taco v6 (3.4L) have a timing BELT, which per the maintenance schedule needs to be replaced, and the corolla has a timing CHAIN, and does not need to be changed per Toyota maintenance schedule.

You would thing the Tacoma is a truck built more rugged, tuff, it should have the chain. The Corolla is a small compact car, doesn’t really pull or haul anything.
Does this make any sense?

 

My guess is that the corrola has an interference type engine whereas the 3.4 is a non interference engine. Interference engines usually have chains because chains are harder to break. If a chain were to break in an interference engine all hell breaks loose and the engine is most likely shot. Just a thought... i could be wrong