Can't see any real problem, I say that because I was based in one caravan park in WA for almost 14 months with-out moving the camper.
I eventually bought a huge silver synthetic tarp from Bunnnings ( $100 + ) and put that over the entire setup, it helped with cooling and kept the rain and leaves off the canvas too.
I was traveling from 1996 till 2008, so as can be imagined I spent some long term stays in various places, when I sold the camper in 2009 it had no major problems with the canvas, other than stains from something like the 'honey' substance that leaks from some trees.