Puzzling RV Wiring

[kbahus]

I just picked up a Nash travel trailer and am working on getting some things sorted out. I have two big Victron lithium batteries I would like to install and was taking a look at the stock wiring and found this relay trifecta in the baseboard. I know marine wiring quite well and have never seen anything quite like this before, nor understand why it is done this way. Three circuit breakers, each breaker has a lead going to 1: batteries, 2: solar port on side of camper (not confirmed), 3: trailer 7-way. The main camper power wire comes off the same breaker that goes to the batteries. Then you can see the other two breakers are connected to the main camper power with jumpers. My question is why and how do I get rid of this mess? I feel a large 60amp or 100amp manual reset breaker with batteries on one side and everything else on the other would eliminate this mess, what are your thoughts?

 

[TheIcemanCometh]

If I decompose what I see, they tried to create a "fuse block" with the two jumpers. It sort of makes sense but is not the cleanest as I am not sure which side the solar and 7 way aux are relative to the battery. If the vertical wire leads to the battery then it is on the wrong side.

The standard would be to have the positive of each battery connected to a fuse then combined at a switch which is connected to the positive busbar of a fuse block. Individually connected to the other side of fuse block would be the trailer DC loads fuse block, the solar MPPT, 7 way aux power, etc.

Victron has some good wiring diagrams