I have towed with my 4.8is. First thing; try to have as less of chain touching the body as possible. What I did was completely wrap the chain with the soft packing foam sheet and tie with soft thread on top so that it stays in place. I had no scratches whatsoever. You can even use some soft cloth to cover the chain. Check the chain at every stop, which you will probably do anyway to check the hitch and trailer connection. Have some extra packing sheet foam handy just in case you need more.

You can also put some removable packing tape on painted bumper area.