Another option....
Now understand my house is a motor home so there may be some difference on a trailer.
You can run the the cable into the plumbing channel, then you can route the cable into the tank bay where the water lines go through the floor, Now you can likely route it outside very easily with narry a hole drilled.
Coil it in the storage compartment or put a barrel connector there.
Job done, no drill (Or just an internal drill through a carpeted panel that will hide the hole when the cable is removed) route power the same way.
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