I've cut mine on past rig and taped it with never a problem. As stated above, proper prep and then really good tape. Wouldn't want something solid under there. Blowind a tire or hitting something in the road could make a thin metal bottom into a problem.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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