I’d certainly recommend keeping it
Simple !!! That’s what Foamies' are all about ... save Light and Thrifty , and they don’t Rot ...
Easy to get a little extra height , and you can leave it Outside , unlike an RV , a Foamie , like a car or truck , does just fine living outside

... leaving more room in the Garage for other things too ...

But with that much floor space (~60 sq.ft. ) , a 56” tall cabin would really be Big enough .... (even 4’ is fine if you’re not unusually Tall ) ... If you have the floor space ...
Here’s what I was thinking about .. easy to make , lightweight , pulls out to 72” wide ...

Please feel free to browse my album ... all my ideas are there ... ( it’s the little camera below the Lego trailer on the left ...next to the PM button )