In our camper, I'm using the stock setup. However, I have a solar setup at home for running portions of my house off the grid.
Most of the components I'm using are found in the marine industry. I particularly like products made by Blue Sea. Very nice high amperage switches, fuses, and well made power distribution panels.
I'd suggest having the inverter on its own separate fuse. I'm using a couple of 1800W Xantrex inverters, and each have their own disconnect switch, and a Class-T type fuse.
I have a separate DC power distribution setup for all the low current 12V items. It too has an isolation switch. Makes working on the system safe.
The power switches are Blue Sea P/N 6006. West Marine has them in stock, but I bought mine online.
The power distribution block I'm using for this project is a 24 position IOTA brand. Each connection has a separate fuse, and an indicator LED if the fuse fails. Here's a pic of the distribution block and the isolation switch being installed:

Here's what the Class-T fuse holders look like:

Here's a smaller distribution block I put on my golf cart, also made by Blue Sea:

Good luck on your project!