have you thought about a frame tent? Most are over two metres high and
traditionally have loads of head room and space. We have several tents and
will take a dome for weekends but always use the frame tent for anything
longer. After talking at length to experienced campers using dome tents it
seems that putting up one of the bigger, more complicated domes takes as
long as a frame tent. The only saving seems to be in car space as a frame
tent is about twice a big as an equivalent sized dome when packed (a big one
is anyway).

--
Hayley
(gardening on well drained, alkaline clay in Somerset)