Hughes Autoformer - 50 amp?

[Art Knapp]

I am thinking of installing an Autoformer in my 1983 Newell.

They have two 50-amp models, a 50-amp 120-volt model and 50-amp 240-volt model.

I believe the way my coach is wired is two legs of 50-amp at 120-volt. Is this correct?

I would like this to be a permanent installation inside the electrical compartment. In what order should things be wired (line from shore power, Autoformer, inverter, electrical panel, etc.)? Which model should I get if I want to have the transformer work for all of the 120-volt circuits? Or do I need two? Is there a better alternative?

Thanks for your help,
Art Knapp