I am curious as to exactly what the OP expects in a kitchen? We have a smaller MH, and are able to prepare anything we desire. Perhaps if the OP could give specific requirements we could understand the issue better. Does he expect to have counter space for the breadmaker, food processor, espresso machine, toaster oven, ...? Is he a gourmet cook who requires 5 pans, 8 mixing bowls, 2 chopping boards, and sundry other things in order to make even a snack? Are he and his family all the size of offensive linemen, and need a large space in order to move past each other? What is it that he feels he needs in order to be able to use the kitchen? No insult intended, I seriously just wonder.
Perhaps it is time for a few lessons in RV cooking, in order to be able to function in a typical MH kitchen. Maybe he needs to purchase smaller (and fewer) kitchen devices. He could contact a manufacturer such as Winnebago or Rexhall; they are good about modifications and could build him a MH with a 4 foot counter in place of the couch. Today's convection microwaves can do just about anything an oven can, so he could eliminate the oven below the cooktop, to provide storage in its place.