What electrical adapters do I REALLY need to carry?

I know they make all kinds of power adapters, in real life how many different adapters do you run into in the wild? I know I need one for 50 amp to 15 amp for my extension cord. Do you really need one from 50 amp down to 30 amp, are there really that many parks that don’t have any 50 amp service?

You will still find some parks that only have 30amp service on the posts. I carry a 15amp and 30amp to 50amp adapter.

https://www.amazon.com/Conntek-14101-TT-30R-Plug-Adapter/dp/B001TO4WCS/

My new trailer came with a 30-50 adapter from the factory.

If you have a generator, it is always wise to carry a bonding plug.