The company that supplies all the toyotas to the UN and other aid agencies is Toyota Gibraltar;
They're not unique in that though, the cars that consumers get and those that are used by the professionals aren't generally the same, especially where the use is going to be much more rough than would otherwise be the case. Land Rover used to have (still has?) the "special vehicle" unit who modified them directly. I expect toyota has something similar, not sure why all the U.N. sales go via Toyota Gibraltar. The manufacturers don't let on that the cars that are seen doing hard jobs aren't the ones that we can buy in the showrooms, similarly to the racing scene where cars on the racetrack often don't share a single part or even a manufacturer with the cars that they are pretending to be. Suckers fall for it all the time.
People do however have this mad notion that a land rover will break very quickly off-road while japanese cars won't ever let you down, it's total bollocks, all cars will let you down if you spend day after day bouncing them off rocks. Some time ago some berk in a pub came up to me out of the blue and declared that if I went out into a desert in a land rover then "YOU WILL DIE!!", total certainty. I said that there's no vehicle that you can trust totally in such an environment, he knew sod all about anything though so the discussion stopped immediately.