Your trailer is 110 volt, NEVER plug into 220, be very cautious of household connections which are usually for electric stoves and clothes dryers.
There are adapters (dog bones) to allow you to plug to different connections. Male and female ends, depending on your need. I use a 30 to 15 amp adapter when at the house (can't use the A/C). I keep a 50 to 30 amp adapter to use at parks where the 30 amp is worn or burned up. The 50 amp service plugs are usually in better shape.
30 amp service to 15 amp service
50 amp service plug to 30 amp adapter
50 amp to 15 amp, you may need this at the house if your AS plug was converted to a 50 amp. You cannot run the A/C or that electric water heater on it, but everything else should work.