Wiring circuit breaker directly to telephone pole?

I want to add an 30 amp RV connection to the telephone pole where my power comes in.

I’ve wired outlets before, but always by attaching to my main circuit breaker box. But this RV outlet isn’t going to go through the circuit breaker box. It’s an exterior box that’ll contain its own circuit breaker, a 30 amp outlet, and likely a 20 amp outlet.

(Note: it won’t bypass the electrical meter, obviously, as that’d be illegal, and my electrical meter has a power cutoff, so I can kill power before wiring up my box)

I haven’t ordered one yet, but something like this:

I have two questions:

1. Can I just wire a circuit breaker directly into the powerline running out of the electrical meter?

I never wired up a new circuit breaker box before, so I don’t know if circuit breaker boxes contain any electrical component between the power from the meter and individual circuit breakers.

2. What do I do for ground? I assume what’s coming off the telephone pole is two phases and a common. Do I just drive a copper grounding rod anywhere into the dirt to ground my RV outlet?