That square raised section you refer to running along the wall can be removed in our 3121RL, don't know if may be different in your unit. If the box is carpeted like ours feel around and you may find screws holding it in place. When I removed the box I had access to the washer water and drain lines, so I ran wiring that way.
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Matt F
2017 Ford F-350
2019 Montana 3121RL
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