When I helped trim the box for my friend we cut almost 1 inch off the ends, on an angle that left him enough clearance. You don't need to cut he whole box to get the box to clean the bed rail. Never touched the bolts or for that matter came close to them.
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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