Welcome to iRV2
, we're really glad to have you here as a new member and are looking forward to reading your posts about your RVing experiences and adventures in your 1989 Winnebago Superchief. You'll find a great bunch of folks on this site who are very
knowledgeable of RVing, the rigs we use, and the places we go in them.
Presumably, by the wording of your post, your coach is wired for 30 amps rather than for 50 amps. Running two AC units on 30 amps along with other stuff such as the converter may be electrically impossible in your coach. Some folks are able to use them both successfully on 30 amps by managing when the compressors start and run.
If your coach is a 50 amp unit and you're using an adapter to run it on 30 amps your solution is simple. Plug into a 50 amp receptacle and you should be good to go.
As you'll see, they're eager to help and share their knowledge and experiences with others.
Again, welcome to iRV2, we're glad you joined.