The Isuzu ban seems pretty damn odd at first sight, but totally understandable - they think that the departure of Isuzu will lower the value of Isuzus in general, potentially turning Isuzu vehicle loans upside-down. Sort of like what's happened with home mortgages in the last 2-3 years

With any new car purchase you are immediatelt upside down by 20%. A car immediately begins to lose value the second it is titled and driven off the lot. It is not til halfway through the loan that you are even break even. I still say is a result of this being restrictions for personnel cars only. Maybe because they are worried about it breaking down and not having a dealer or parts network to fix the car.