the pre-attached canvas will not prevent the water from intruding into the hinge area, which is generally where all the problems occur because the water will pool there.
either the wood around the hinge area gets soft or leaks into the storage area underneath or it can be absorbed into the bunk door at the hinge and cause delam.
the current canvas doesn't prevent that, anymore than the older style. if you look at it, which i have carefully, the canvas tent end "bridges" over the hinge area but has no effect in stopping water that gets past the seals to pool in the hinge.
the only thing it does is prevent water entering the canvas tent from the edges.
that's why good seals and constant vigilance/maintenance is the key.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC