We own a CUB SPACEMATIC the camper is ten feet long when folded up for traveling, opened up it's 20 feet long, the top transforms to a ten foot floor space bige enough to install bunk beds on one side and still have space left over. The space still available in the trailer with the Queens size bed is still quiet large and does not intrude to the floor space at all.
On top of all that, we have an annex which when attached with walls gives an area of 8 feet wide by 20 feet long.
How much space do you really need ?