I wonder if that's why Ford, Ram, and Nissan all at the same time decide to discontinue their mini cargo vans a year ago.

If you're talking about the ford transit (I'm just guessing) but maybe the tariff rules changed? IIUC The transit was shipped to the US from europe as a "bus" because it was configured with car seats on board and then they would strip the seats and ship them back to europe. Buses are exempt from tariffs otherwise municipal public transit would be even more in the drink.