The bedroom of our Freedom Elite 32FE has some similarities to your Four Winds in that it came with a short queen mattress and you have a slide in the bedroom that prevents easily installing a conventional queen mattress because of interference with the furniture at the foot of the bed when the slide is stowed.
I’m attaching a link to a mod I made that allows for a longer mattress.
If you have any interest in doing something like this to your MH, I would be happy to provide details on what I did.
https://www.thorforums.com/forums/f2...ods-14863.html