Keith Stelter wrote:
Ok,
On one end of my house I have no electrical wiring run outside except for
the 220V (single phase) service to my air conditioner. It has a double pole,
40 amp circuit breaker feeding that air conditioner unit. We want to park
our camper on that end of the house, and I was wondering how safe it would
be to wire up a 110V box from one of the legs of the 220V air conditioner
box?

It would not be safely possible to tap the A/C circuit for a 120 volt
load, because no current carrying neutral is available.