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A: No they cannot unfortunately
A: The strap is a limited length. You could change it to a longer strap (not included) and use the same mechanism. If you meant connecting 2 to make it longer, I'm not sure if it's rated for that or if that will be safe.
A: It should work fine on the bb hoop. I have had mine out in the sun for a couple of years, eventually you will have to replace them but they should last quite a while.