The reason a 13 year old Mitsubishi Montero with 200 000+kms is still worth 8 or $9k is the same reason there are TONS of 13 year old Tundra's on Autotrader with 200 000+kms from low teens to low $20k's.
They are relatively rare compared to the competition (GM, Ford, Dodge), they are very reliable, and they just hold their value.