If you are considering a transit you will need the 280 minimum in a short wheel base, but best to go for a 300, 330 or 350 medium or long wheel base. these will carry the weight better. In older vans ball joints will go due to the weight you are carrying especially in a vivaro with a lower payload you will be replacing the wishbone at some stage. If you look on BCA site it will give you the model no of all vans. Good luck, Jon.