As for the trucks: I believe they are from Intermountain GPEX milk reefers. The GPEX model pictures online show trucks the same, it seems. You'll have to shim up the bolsters/truck center to get the trucks to clear the underside, and install body mount couplers.
Good thing about this car is there are tons of photos of it online. Only I forgot to put in the two small screened openings on one side of the car.