I've seen older trailers around here with a pole like that with the meter base and breakers on it. There was a spot to connect several wires to the 3 or 4 main breakers in the pole mounted box to the fuse panel in the trailer that acted as a sub panel. They were owned by the property owner (individual or trailer park). All the ones I saw did not have transformers or primary lines on them, just the service drop coming from another company owned pole.
I'm pretty sure any company owned pole would have some sort of ID tag or plate unless it's gone.
If it's not company owned it'll be their responsibility to fix, just like the weather head and riser would if it was pulled off the house with overhead service. My coworker had that happen. His service drop hangs lower than normal and comes from a pole across his neighborhood street. A lost semi truck pulled the riser, weather head and cables off his house, tore the siding and broke the meter base, power company said their responsibility stops at the transformer. They came out and disconnected his power due to lines down, he reattached everything himself with advice from an electrician customer got it inspected and then poco same back out and restored service.