The 50 amp refers to the CURRENT available to you. The voltage is 110. You are already set up.
You will need and adaptor plug to make your standard household looking 3 prong plug convert to the odd looking "Dryer" type plug.
You should carry a set in your trailer all the time as you never know what kind of outlet you will get. Most parks have a regualr plug and a 15 amp service, and an option for the bigger different plugs for the higher current outlets.
Camping World or Wally World has them that go both ways, from little to big, and big to little.
Be careful on what you run with the standard plug.. the breaker will probably trip if you try to run your air, microwave
and electric cricket chaser all at the same time on a 15 amp service, but it's better safe than sorry.