Sorry.. just to clear things up.. the forth is the Expanda!!
here was me also thinking a child was on the way!!! it was my reason for moving to the 16.49.4 with the bunks worked a treat but with 7 weeks till baby is due its all getting very real!!! not sure of the ploy that would be required to move to a 17 or 18, but no more kids!!!!!:nono: