^ BFL, can you clarify a bit.
Assuming the Original Poster (OP) has the original charge controller somewhere near the middle or rear of the RV.
Ignoring the inverter suggestion for a moment, You are suggesting putting the new Progressive Dynamics (PD) charger in the front storage compartment. This will allow the OP to run a much shorter charge cable to the batteries by going through the floor and up to the batteries on the other side of the wall.
The original #8 wire from battery to old charger/fuse panel can be left alone as it is what powers the coach. The only difference is that this #8 wire is no longer used to charge the batteries.
If possible the OP should find a way to disconnect and cap off the 120V AC and the 12V DC wiring that fed the original charger so it is out of the picture.
This makes sense as far as the battery hookup. But how does the shore power get to the new PD to charge the batteries? Would the OP run an additional three wire (pos, neg, gnd) from the original breaker box down through the floor in the rear and up through the hole in the front by the PD? If this is the suggestion and the user has an 18 foot run, would standard 14g wiring be sufficient for the 120v AC run?
Bringing the inverter back into the equation. Am I correct that your suggestion of running the shore power cord forward and into the front compartment is only for powering the RV through the inverter?
When running the trailer on batteries and using the shore power cord to the inverter. The OP must find a way to disconnect the PD charger to prevent a losing electrical loop. The loop being the batteries power the inverter which goes through the shore power cord to the coach. The coach then uses the newly added AC wiring to the PD charger and tries to charge the batteries. So the batteries are trying to charge the batteries.
Did I get it all correct?
