Easy:
Insulate the inside walls of that space and toss a folded blanket in there instead of messing with a pool noodle. If you get the blanket stapled to some areas it'll be self setting and fold and unfold with the slide.
There's no need to cure the exact spot of the seal.
And/Or
Fancier:
A small 12v silent computer fan blowing into that opening from your coach will serve to counter any exterior cold air and will also set the area to interior ambient.
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