The right size generator/inverter?

At 120 volt, each device you mention is 10-15 amps. 5 devices at 12 amps is 60 amps times 120 volts= 7200 watts peak so a 6500 watt generator may be the size you need, but a 10 kw is much better choice. Not all of the devices will be operating at full load at the same time. Read the label plates on the devices and total them to check my estimates. A 6.5 KW is the size that many RVs are supplied from the factory.