I copied shooted's manual transfer switch installation and used the same cam switch. It has performed as advertised for two seasons. There is a lot to like about the installation.
1. No sub-panel required
2. All CB functionality is retained
3. All circuits to be powered by shore power only are automatically switched off when inverter is selected
4. Center "off" position assures "break before make"
5. All 120V AC outlets are powered by inverter
6. Wiring is a bit of work, but not complicated or difficult
7. Shore power cord can be connected to shore power or generator and not require an additional transfer switch
I fail to understand how a manual switch with 32A rated contacts would not perform as well as a 30A rated ATS. Also, I never change switch position under load.