I know that you are discouraged right now, but I think that it is more the pain/discomfort from your shoulder talking, if anything. My advice is to keep the truck(that's a neat truck, and these 1-tons aren't exactly plentiful) and focus on your health for now. After you have the operation, and have recovered, THEN decide whether you want to sell.
Don't be quick to make a decision(or mistake) now that you will regret for many years to come. Besides, the truck can actually help in your recovery by being your motivation, and working on it/getting it finished will give you something good to look forward to. Look at how much you have accomplished so far; follow it through to completion. I wish you good luck and good health.
