You shouldn't need to cut the bottom. On the inside there should be a removable panel or shelf to acess that space where the cable is stored. That's a very typical setup if the panelbisbon the opposite side (door side) znd the cablenis on the driver's side. In our camper there's a panel held by 2 screws under the pantry.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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