How to modify, remove, or replace part of an image?

I would draw vector paths on the pickup truck and trailer shapes using the Pen Tool. This would be easier to do on a high resolution image. The paths can be drawn and edited to cover the truck and trailer shapes precisely and then turned into selections. The existing "lava mae" graphics can be covered up with new fills. Additional paths would need to be created to re-build shadows and seams that run through the existing graphics in the image. It sounds complicated, but it's not all that difficult to do. I use an approach somewhat similar to this when designing vehicle wraps over photos of a client's vehicle.