New tanks come with straps that are designed to go over the tanks, and bolt into the bed of the truck. If your going to be taking the in and out of your truck box you better have at least a couple of nylon straps across it. If its not tied in and a DOT stops you, you'll get a ticket, its not a nice ticket either. They want them secured so that in an accident they don't come out of your box. They don't like the nylon tie down straps, but if its tied in with them, my experience is they won't write you a ticket, they will probably give you a warning, but its not going to cost you a $240 insecure load ticket.