Good point. And I have a similar request for Isuzu Troopers and Bighorns. Because they all share an UBS chassis code, and datation is a bit of a mess, I've begun to add a 1 or a 2 in the "Mk" field. But the displayed result isn't the same. For the Bighorns, it's Series I or II, while for the Trooper, it's just I or II.

Can the Troopers have a "Series" mark too ?