30 amp 110 or 220 volt?

do you have a voltmeter?

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?

50A is 120V also.

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

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.

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

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

What would make you think it's 220?

RV electrical system