Depends on the structure and if the buoyancy is rated to it.
Yes. They will work for that. They are pretty durable.
Just one item.
Weight 72 lbs. Flotation capacity 575 lbs.
24” side to side.
Yes, this drum is filled with foam.
It is not recommended to remove the tire permanently.
Thank you for your recent inquiry with The Home Depot, Amy. We do not carry this wheel separately, however you may be able to locate it with the vendor, here: http://www.techstarplastics.com/index.php/dock-floats-and-accessories/wheel-float We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot.