Battery Monitor wiring

I've done a battery upgrade on my 2021.5 195 and want to run battery monitor wires monitor from the wall inside the door (across from the fridge) back to the battery.  Want to keep the gauges all together.  My unit has corrugated plastic on the under carriage and I'm aware of what a pain it is to remove it (previous fix on the water tank hose) so looking for some wiring advice.  Any thoughts on how to run the battery monitor wires?  Wall, side, ceiling, snake it down to the top of the corrugated, etc.?  I'm thinking that my solar controller already has its wires from this location back to the battery but not sure their path back.  Just need some advice on a possible approach with minimal removal of the underside corrugated. 

Thanks.  The manufacturer recommends that the shunt be mounted on the battery negative at the battery, then all other negatives on the other side of the shunt.  But your idea would make it easier.

Ok, you have a monitor with a shunt that goes in the negative leg. Good.

The shunt needs to be mounted in the negative leg at any point between the battery negative post and the first place a load or source is connected. That way it can measure all the current in and out of the battery.

So if you say have a solar charge controller connected at the battery terminals then yes the shunt would need to be mounted there and the negative conductor to the controller relocated to the side of the shunt away from the battery.

If the first place anything is connected to the negative lead from the battery is at the panel then you can mount the shunt there.

Can't help you with those specifics, I have a 179 so the routing is different and there is no underside covering material in the way. Maybe someone with the same trailer might be able to help.

Reviewed the pictures, thanks. Similar (but much nicer) to my double 6V setup.  Where does the wiring loom start and end?  Did you fish wire through it, or open it and lay the wire into it?