Dunno. At first glance, I'd lump it in with TREX and most other artificial decking that is NOT particularly resistant to bending and is considerably heavier than wood.
I'd have to play with a piece to get excited about it. My trailer has at least a couple of feet between each cross-member and I'd have to be pretty serious about using this stuff to weld a bunch more steel in my trailer (more weight) just so I can put in a heavier decking board (further diminishing hauling capacity).
Considering my decking boards last well over 5 years (the longest I've owned a trailer and those boards...in a trailer I sold my parents...still look perfect), I think wood works just fine.