Dog, you’ve come to the same conclusions we have ... I actually like the look of the burlap, but then I kinda’ like the weave look ... and it is quite Strong ...
Update: ... After enduring our most Brutal summer , the canvas fabric on mine is totally unchanged , no problems , no lifting despite some really Intense rainstorms and HOT searing Sun ... I figure as long as it’s kept painted , it should live outside very well ... No problems ... no special care ...
And as far as hammers

, the only thing I can think of being similar is tree limbs... (been there) But the damage would be very localized and cheap and easy to repair ... and due to the construction , if you had some damage it wouldn’t leak/wick water (rain) all over the rest of the trailer , like the more conventional trailers do ...
I know some of you have to deal with Snow

, but I can’t see that affecting the Foam/fabric either ... But as you reach freezing , the foam does tend to be more brittle ... Might be good to test samples of foam in Very cold temps ... just to see for yourself ...
All comes down to what “look" you like...
Just FYI , I’m still searching for a big pile of free Jute sacks (down by the wharves) ... for a more “primitiveâ€