If the rails you are referencing are lower than the full length rain gutters and are mounted just over the slides being a little longer than the slide those should be for attaching topper fabric to trailer. They should also have a slot facing out to attach topper fabric. Hope this helps.
Doug
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Doug, Virginia, Buster & Sam
2017 Ram Crewcab 2500 6.4 Hemi Delmonico Red Pearlcoat
2015 Flagstaff 27RLWS
2005 Road King
5 Grandkids
Brianna,Frankie,Tyler,Tori&Jocelyn
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