On our 2019 3120RL we used the Dometic Solera slide toppers. The dinning room slide that has the awning attached to it came with the “Slide Topper Prep Kit”. That has a shorter profile mounting bracket that will fit within the wall space bellow the upper trim piece.
https://www.lci1.com/toppers
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John and Nancy
2018 f350 SRW 6.7,Airlift 5000 w/compressor, Andersen Ultimate hitch,2019 Montana 3120RL, 4-100Ah LiFePo4, 1200W Solar with 2-Victron MPPT’s, Victron Multi-plus 3000/12/120, Victron BMV-712, Renogy DC/DC 40Amp charger, WeBoost RV 65.
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