Hi Chuck - While I didn’t go the 48V route, I stayed with 12V and did all of the things you’re planning for your setup. I posted those in this thread:
I went with all Victron components and Battleborn lithium batteries. The Victron inverter allowed me to supply 120V AC to both legs for 50A service which made the AC side wiring much simpler. The main difference for your setup will be supplying 12V DC using a DC to DC converter similar to a Victron Orion to take the 48V input and supply 12V output for the RV 12V system.
Not sure what components you’ve selected, but I found the install to be pretty straightforward. You’ll be able to use smaller gauge wiring for the DC side going with 48V, where I had had to use 4/0 wiring for my 12V connections between the batteries and inverter. The 120V AC wiring was the easiest as I was able to use the existing wiring and just splice in the the inverter output between the shore power and generator.
I still may convert from 12V to 48V in the future, mostly to save weight on the batteries and DC wiring.