2 100 watt panels and an inexpensive PWM controller will keep 2 GC's charged under most conditions. From what you describe a your usage, 2 GC's should be fine. For radio, standard radio/CD in most trailers are 12 VDC off the battery. Unless you have a REAL reason to use a microwave, I'd not get a large inverter (almost all you see in these packages are modified sine wave and will not run a microwave). A good 150 Watt Pure sine wave inverter will cost $150, and will run a decent sized TV and a DVD player.
You will need to change all lighting to LED.
We have 2 60 watt solar panels flat mounted on roof, and a 100 watt portable panel. Seldom need to run generator (has happened in a few densely wooded sites where there was NO solar to be had). We have a 2000 watt Honda inverter which was purchased before we got the solar panels, if I were to do again, would get the 1000 watt Honda; the difference in price would have paid for a lot of the solar, and wouldn't be so heavy to lug out of the storage bin.
Good Luck and Happy Camping,
Doug