Snatch strap rating should be 2 to no more than 3 times the actual weight of the lightest vehicle in the snatch.
If you haven't used the 11,000 Kg one I would take it back as they haven't upgraded you at all.
All they did was find a way to take your money when they were out of stock of the item you needed rather than get you one in or have you go elsewhere.
... and when snatching out a Sierra use either their strap or the 'laccy out of your jocks