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What you need and want is a transfer switch that will disconnect the plug from shore power and connect it to the inverter, and vice versa. You really dont want to have any POSSIBILITY to connect both shore and inverter at the same time. that could dammage the inverter if you backfeed it, and it...

You determine the size of a wire base on the max current that will flow in it. Then you go on a voltage loss calculator and you aim at lower than 3% loss. So for 30 amps, you would use 10 awg wire. Then for a 10 ft run(single way), at 12.8 volts and 30 amps, you would chose 8 awg wire to obtain...

I dont know for the recent dryers, but the older one do need the split phase, as they use the 120 volts for the motor, and the 240 volts for the heating element

When i say older model, i mean 10 to 20 years old. They use a nema 14-30 plug, witch is a 4 prongs Im 65 and i never saw a 3 prongs dryer plugs. The older dryers i remember were direct connected still using 120/240 Maybe it was different in the US, im canadian.