Mine does the same thing. It makes a slight thump which can be normal. The slide out is changing levels during deployment. Unless it is real laud I would not be too concerned. Since it is new, you should mention it to the dealer and just have them take a look at it.
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2015 Flagstaff Super V Trailer
Model 26VFKS
Towing with F150 Crew cab 5.0L
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