30 amp 110 or 220 volt?

What would make you think it's 220?

RV electrical system

120 volts for a 30 amp. Make sure the electrician knows and check it with a meter before you plug in.

110, unfortunatley trying to run 220 on a TT30 receptive seems to be a common mistake among people.

This is the issue even professional electricians get confused on.
Your 50 amp service is having 2 legs at 50 amp EACH.
The 30 amp adapter connect both legs into single 30 amp 120V plug.
You can find lot of stories about people plugging 30amp 120V RV adapter into 240V dryer plug (yes, you can make it fit) and sparks are flying.

50A is 120V also.

For few dollars more put in the 50A vs 30A at home

I am using two 30 amp breakers that are hooked together as one presently in the breaker box that used to go to a stove that we no longer have. I bought a 30 amp RV box at Lowes. So my present wiring is the top 30 amp breaker in the box has one wire going to one side of the new 30 amp receptacle. The bottom 30 amp breaker is wired going to the other side of the new 30 amp receptacle. That is why I figured it is 220 volts. Is this wired right for a mh?

do you have a voltmeter?

Yes

I just don't want to power the new system up unless I am sure it is correct.

30A RV receptacle is 120 volt. Only one breaker is connected and two grounds.

I would get a 50A recep and wire it to the 30A breakers. A 50A rv rarely uses more than 25A on each leg. That way you could run both ACs if you want.

DO NOT CONNECT 220 TO A 30a RECEP.

You can Google this information.

clicky link