Sponge, our older 23SS had snaps for the front mattress.
but we had the front bunk door replaced under warranty.
The dealer that did it, didn' t install new snaps.
That was 6 years ago and we've never had an issue because the canvas holds the mattress against the closed bunk door.
I don't see why it wouldn't be the same for the pre-attached canvas.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC