I don't have the same camper as you, but I can say that with our old pop up, the canvas was just pulled down over the platform and then bunjeed underneath. My kids shared a bunk and never had even the slightest issue, if that helps any! And believe me, there was a lot of kicking and rolling around (they are now 5 and 8). They fight like little monsters!
All that is gold does not glitter,
Not all those who wander are lost.
Karen, Scott, our daughers (6 and 9), and Finley (Finn) the wonder lab.
2013 Jayco Jayfeather X23B
2001 Viking 2485ST pop up