Small update:
In addition to selling some more parts, I was able to get the car hauler undercoated, new wires and lights ran, and new treated wood. I am planning to paint the trailer this weekend and get the trailer brakes going so I can get it inspected and go pick up another donor truck on Sunday.
I am hoping soon I have enough money saved up to get the double hump heads rebuilt so we can get that 400 purring again!