Typically motorhomes in general have room inside when the slides are in. The assumption being that you'll be inside a lot more than a TT or 5th wheel--especially while moving. Someone will want to get to the fridge
For TT's and 5th wheels many are un-navigable when all the slides are in. (This is why you see slides of only about 2' in depth in motorhomes but in TT's and 5er's 3' or more.)
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