Securing Ingots and Slippery laminate flooring.

If the panels aren't stacked so you can belly strap I'd try to choke them together. The straps probably won't be long enough but a chain to the strap hook might do it.

 

Yep, I've hauled ingots out of Houston port up to Alcoa in Lafayette and LaPorte, IN and they stated "NO CHAINS" on the bills.... I was like WTF?? But it all worked out anyways, just had to make them headboards out of my 4x4's to add a piece of mind for me. They didn't want them tarped, but no chains LOL

 

The chains might cut away at the alum. God forbid they lose a 16th of an inch.

 

You place the 4 x 4 under the load. Front and back ends. That way it pitches the load towards the center of the trl. That way if it wants to walk, it will just walk towards the center no walk out front and back