I used this one in my passthrough which seemed very sufficiently weatherproofed:
https://www.amazon.com/gp/product/B071WBSNHJ/
None of the pictures show it, but there is a thick rubber dome shaped covering going the full length of the strip.
Mated perfectly with the following:
https://www.amazon.com/gp/product/B01FT4RBBM/
https://www.amazon.com/gp/product/B01FT3BIXK/
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2019 GMC Sierra 3500HD Denali Diesel DRW (Crew Cab | 8 Ft bed | OEM Puck System | Curt Gooseneck Ball for OEM Puck)
(OLD) 2018 GMC Sierra 2500HD Denali Diesel (Crew Cab | 6.6 Ft bed)
2019 Grand Design Solitude S-Class 3740BH-R Fifth Wheel (Onan 5500W LP Generator | MORryde SRE4000 Suspension | 3x Cross Members | Sailun S637 ST | Reese GooseBox 20k 2nd Gen)
(OLD) 2018 Keystone Hideout 28RKS Travel Trailer
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