In an RV I'd think that the PV system wouldn't get much use unless you went full time, and gas is cheap by comparison.
Quiet boondocking would be the best use I could think of, but again it might cost $6-$8/watt to install a PV system that could power lights and a fridge. The PV would have a terrible time trying to keep up with A/C. I don't know if the reduction in gasoline/generator use would ever recover your costs, and if RV solar is like home solar then no one will ever pay you for the feature on resale.
Audrey has answered your questions, but I'd like to add the 2 cents I have learned by reading.
Full-time boondockers want to enjoy nature in solitude, and do not want to stay on RV campgrounds. They also save money by not having to pay campground fees, though they have to visit once every few days for tank dumping, fresh water refill, and a luxurious shower. A PV would not be economical for weekenders.
I have not read of any RV'er being able to run a fridge from the PV+battery. It just takes too much power, so has to be run off propane. The electricity is sparingly used for microwaving, lighting, laptop PC, small TVs, etc... and must be carefully rationed.
The ammonia-absorption RV fridge is pain in the rump, though. It is expensive, slow to cool, and does not last long. I have read of class-A owners getting rid of it and plugging in a normal residential fridge. Now, they cannot stray far from a 30-A receptacle, but these owners seem to not care about not being able to boondock.
About the AC, it is simply not possible to have enough solar cells for an RV to have a self-contained AC.
There is also the problem with the surge load at starting. The induction motor inside the AC compressor typically needs 2.5X its normal current to start. Just by reading the wattage consumption of a typical 15,000-BTU/hr RV AC, same as a mid-size window home AC which is run off a 15A home outlet and hence by definition needs less than 15A X 115V = 1725W, one would think he can run it with a 2KW portable Honda generator. No, not so. One would typically needs a 4KW generator for the job, even though the AC motor is an inductive load and actually consumes less than 1725W. Additionally, generator ratings are stated for resistive loads (because the numbers look better), but the only resistive loads we use are incandescent light bulbs.
So, lugging around a 4-5 KW generator is no fun. When I buy an RV, I would not want to do without a built-in genset either. It is just too tough to do without, though I would rather use it just for emergencies. I have done a bit of reading and do not think that full-time boondocking is for me either. Too much of a spartan lifestyle for us. Our 2nd home in the boonies is close enough to nature. When traveling, we would want to stay close to the cities and their restaurants. Cajun food anyone?
As an EE who has designed power supplies for electronics systems...
Alright! Do you still have a Tek scope tucked in the basement of your Alpine? I was wondering if there would be room inside an RV to have an electronic bench with an antistatic top, and shelves for the instruments