Best Way To Wire Outdoor 220v Plug & Socket

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Steve2

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Alturas, CA
Hi, newbie here seeking advice.
My background: I’ve repaired electronic equipment for many years for a living. So I’m familiar with the principles of electricity but never worked with anything lethal. So I will need your recommendations on the hardware needed for my project.

I have a semi-truck box trailer I'm converting into a workshop. I have removed the wheels and suspension and the van box trailer is now sitting on railroad ties on the ground. Because it’s not on a permanent foundation I'm not allowed to permanently wire it to the house. So I’ve decided to wire it so I can just plug it in like a RV in a campground with a 220 volt 50 amp RV plug and socket when I need to be in the workshop.

So I will need a 220 volt socket on the outside of the house along with the 220 volt RV plug and socket on the trailer. But there are no empty breaker spaces on the house breaker panel. So that means I’ll need another panel or sub-panel. Seems like it would be easiest to just connect another breaker panel to the wires coming from the meter and then wire a 220 volt outdoor socket to a breaker in that auxiliary panel.

Question: Do you agree or is there a better / simpler way to attach an outdoor 220 volt socket plug to my existing house setup?

There appears to be plenty of room for a couple Y electrical connectors under the meter with wires exiting to another panel. I’m not worried about overloading the wires from the power pole to the top of the meter because other than some LED shop lights, a vent fan and perhaps a 1200 to 1500 watt space heater, all other power draws in the trailer workshop (such as band saw, table saw, drill press etc) will be very temporary.

Attached are pictures of my existing home panel setup.
Thank you, gentlemen, for your help and recommendations

< edit: how do I upload pictures? >
 
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