to panel 62 of the first expandable module 60 cable 306 may extend from reel 304 of a winch 178 through pulley blocks 310 over pulleys 312 and 314 along the outside end wall 86 and may pass along the outside of side wall 84 through a cable guide 316 to another set of pulleys 312 and 314 at the other side of wall 84 cable 306 may extend along end wall 88 to anchor 318 on side frame member 13 winch 178 may be manually operated or connected to a drill or other power device through a socket 302 winch 178 may be fixed to the wall like winch 176 or in one embodiment it may be mounted on rails or slides 308 to be movable to allow the winch 178 to be stowed out of the way of wall 66 when the shelter is collapsed in particular as shown in fig3 a and 6a slides or rails 308 may allow winch 178 to be moved toward first end 14 out of alignment with end wall 66 of first expandable module 60 in this way when shelter 10 is collapsed wall 66 may abut the inner wall of section 12 to allow module 60 to be collapsed as far as possible without interference from winch.