Even if we assume you meant a Dodge Ram van (which would be a much older model, likely a Ram Wagon or something similar), whether it has two heater cores depends on the year and specific configuration. Most vehicles with rear heat will have *at least* two heater cores: one for the front and one for the rear. However, some systems might use a single heater core with complex ducting to distribute heat to both the front and rear.
To know for certain if a specific Dodge Ram van has two heater cores, you'd need to consult its repair manual or a parts diagram specific to that vehicle's year and model.