Hiya,
I have owned a few Cabanon frame tents adnd still have one now. The very first one I bought second hand (montpellier) came with a huge plastic groundsheet which I have hung onto. I also have a huge tarp and a breathable GS.
What I use depends on the site rules and weather. If the site deems that only breathables are acceptable then thats what we use. BUT I walways place a groundsheet (normal plastic one) under the bedroom tents to keep them clean. If the site does not mention breathable GS and the weather is damp I use either the tarp or plastic GS with the breathable one on top as a cosy carpet.
What annoys me - is that in my frame tent some sites expect me to use a breathable GS (not so good in wet weather) but the tent nextdoor (sometimes bigger) has a built in GS so thats OK!!
I also once stayed on a site that insisted we lifted the bedrooms every other day. A nightmare with all the bedding and beds and no where completely dry to put it as it was a wet week and we only had the breathable GS in the living area! We have never returned.
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