I've scrapped a few mattresses before but that's really scrapping the bottom of the barrel. I have these German Knipex wire cutters that go through stuff like that like it's Romax.

If you're doing recliners, go after office chairs too. You get the main cylinder and the the arm and back rests cough up three pcs. of #1 prep. Takes about 30 seconds to scrap one with a power screw driver. I think I find one of these in every roll off box.