Trucks

Where do I buy Ammunition, supply and fuel trucks?

I'm trying to set up a new air unit and its telling me I don't have any of these despite me having over 26k trucks somehow lol

Pretty sure there was only one kind of truck in the game in the good old days!

Thanks in advance folks

Trucks are traded on the market.
check the trade menu.
If you do not know the trade menu and the associated pages, take the opportunity to check them out.

Ammunition is on that same market but also on the Army menu option.
this is another important menu if you are building an army.