Those slide seams on my 11 year old rig have butyl rubber tape under them, No caulk ever and they have not leaked on my rig. If you look closely you can see the butyl rubber tape squeezing out on mine.
Check and if you see that don't worry about it. Any caulk added will be loosened by the slide seals as they move in and out.
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2011- 351RLTS Eagle, MorRyde suspension/pin box,
2017- F350 6.7 PSD Lariat FX4,SRW, SB,CC
Hughes PWD SP-50A, TST TPMS
Gator roll-up bed cover
B&W Turnover ball, Companion Std hitch
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