the backup plan should be strap #2. :thumbsup: if you broke a 30k lb strap, what good is that chain?
having said that, I have a big ol' chain in the truck. but it's there for other reasons (like towing a broken truck back to camp). the strap is used only for recovery to keep it as pristene as possible. keep that strap clean (wash it out after use) and away from sunlight and heat.