Chain and Sprocket

So, just to surmise (as I am interested myself):
Chain ok for light work
Tank treads better all round?

Yes chain is ok for light work, it can be used in heaver work if you take precautions, such as doubling it up, making sure it lines up, and not jerking it. If you are going to transferring a lot of torque I would not use chain and you really increase your chances of breaking it.