Re: Tires as Fenders
I'm going to guess that lightweight foam means open cell, which gets real nasty real fast when warm and damp. And closed cell foam is expensive. And you can't blow mold a vinyl envelope around either one of them, so now you need a whole different manufacutring process. Closed cell will also tend to rupture cells every time it goes squish, although foamed neoprene is strong enough it is damned expensive.
So...it all comes down to money.
Can't you put down some helix anchors outboard of the hull, attach float lines to them, and then pull the boat away from the wall when you secure it?