Shouldn't be
When the slides are open or closed they are sealed andcritters or cats can't get in or out. Just make sure that you have no oversized plumbing openings that need to be foamed. 
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Jim, Sharon & Riley
2018 Keystone Alpine 3500Rl
2016 Ford F-350 Dually
Curt Q24 hitch for in bed puck system
Fulltimng.
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