My wife and I are thinking of making a WFO our next big project. We live in PIttsburgh, PA and from what I've been reading I would need a rather thick slab or floating slab to cover the 40". We are only going to live in this house for another two years or so. Any thoughts on a mobile base or another foundation that wouldn't require the work of a large slab? Would I be okay with a 6-8" slab on my soil (since I only anticipate two years of use out of this oven personally") Any help appreciated.