We are both right -
The early Jackaroo's were box shaped and same as your Trooper. At that stage we also had the Frontera from Spain, and the MU as a grey import.
Then the later Jackeroo's were the same as your Rodeos. The Frontera's were discontinued in Australia about the same time.
Our "Rodeos" are utes, or pick-ups in 'merican lingo.
PK