Jeff_in_The_Dalles and K-Star thanks for the replies.
I just got done looking at the upgrades in the Toy hauler section and he used 4ga power wire used in car audio systems for several different reasons. So since I have today off I have been working on the install, well not the real install just the think and get items part. The new converter will fit in the bottom of the entertainment center on the floor under the bottom drawer and there should be enough space for air flow for cooling. So I was going to plug in the unit to see how much noise the cooling fan made but the plug is not the normal 120V wall socket so I will have to wait for the trip to Lowe's. The entertainment center sets right above the battery tray so I will run new 4 GA wire with a length of 3 to 4 feet so there should be no problem with voltage drop between converter and batteries. This way I can also mount the control wizard remote by the fuse panel.
As far as I can figure on the Alfa is that the Magnetek is wired to the batteries and then wires are to the 2 bus bars with ATO type fuses for the different circuits. I have found no relays or other equipment in the system so the upgrade should be very simple to do. I plan on finding the 2 wires at the batteries and tape them off and just unplug the Magnetek and leave it in place.
I also don't like the spider web of wires attached to the top of the batteries makes it imposable to check the water level. I plan to mount 2 power feed junction blocks
in the battery compartment and then run a battery cable to the tops of the batteries with battery cables connecting the batteries together. The battery tray base is the size of 2 group 24 batteries so the length will be OK but the width will be too small but the opening has enough height. I also plan to add 2 6V batteries in a sealed and vented battery box in the space next to the water heater in the underbelly. I will have battery cables made up to connect the 2 banks of batteries.
Next will be the install of a Progressive Ind. Surge protector but that will have to wait till this winter so I can shut down the shore power to pull the circuit panel and shut down the A/C.