don't why Jeep was used as producer as they don't really have anything to do with this trucks Kaiser did build them and 1962 they became Kaiser-jeep but that's about it
From what I remember, we had many as Kaiser-Jeep, and it was discovered that they were sold as just Jeep and not Kaiser-Jeep (as we have none with that make), hence why they were all changed.
But if they are too old, indeed it is not the right producer.