In general, electric is not the most efficient way to do things that involve moving around heat - cooking, heating, and refrigerating. These activities are generally beyond the scope of what you can do with the amount of energy you can collect with solar on an RV.
Doing these things with propane or a similar fuel is much more efficient than burning fuel to run a generator which then powers these things electrically, or worse yet - stores the energy in batteries, converts to AC, and then powers these things. Each of those conversion steps is inefficient and lossy.
So - if you plan on boondocking or dry camping any significant amount - I'd say that all-electric is not a good plan.