I think the pittman motor will draw a little more than 2 amps under heavy load. I have some weaver RS3 models that use a similar or the same motor, and they will draw a little more under load. So the best idea is to test the current draw under load and see what it is.
As for the trucks, I have a pair of P&D F3s that might have the same brass trucks which I assume are what you are referring to. I did not disassemble mine for painting that I remember. I would be really cautious because of the complexity and springs.