im not a fan of the chain being there. i did it on my old truck one time and took it right back off. if you like it, keep it though
I had a chain on mine for a month during the summer. All it did was scratch the bumper I say no on the chain
plus if you do get stuck, its way more of a PITA to get it unwrapped from your bumper while it may or may not be underwater or at night then it is to just grab it out of the bed