Along the edges of the bed, pool noodles are good, if the bed is centered in the opening. My first bed was, but my second TM had the bed mounted off-center. So, the noodle didn't have enough friction to hold it in. I split two noodles lengthwise, slipped them together, then they would stay in place overnight.
I also put some white rag strips in the openings between the side walls and the ends of the lower box, as there were gaps there. Also put them in the corners where the endflaps and side flaps didn't seal completely. The TM can be drafty, unless you get something plugging all the little openings that come with the expandable design. Worth the tradeoff, I believe.
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