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I've had 2 F350s & used Extang Revolutions on both. The cover rail only sticks up about 1/4" above the bed rail. If your rv were to brush the top of the bed rail, the rv will likely be at a sharp angle, compared to the truck, & the underside edge of the 5th wheel will contact the outer edge of the bed rail. The tonneau cover rail sits on the inside edge of the bed rail & shouldn't be affected, unless you seriously crunch the bed rail. I have twice lightly scraped the bed rail, & in both cases, it did not touch the tonneau cover rail. The cover completely comes off the truck easily also. I have both a 5th wheel & a triple slide truck camper. I have to remove the cover when using the truck camper, & I roll it up & hang it under one of the bed rails. Then, if we stop somewhere for an extended time, & remove the camper, I can put the cover back on & have a covered bed.
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