the expandable wall 22 side panels 24 and 26 pivoting floor 28 and pivoting ceiling 30 and awning 32 to move relative to each other side panels 24 and 26 are rotated into the closed position first where they lie parallel with frame face 114 within the thickness 91 of opening 80 the next step is to activate linear actuator 133 to move carriage 116 and the upper slide rails 104 and 106 toward shell wall 66 this begins moving expandable wall 22 towards the frame face 114 as well as moving lower slide rails 108 and 110 in the same direction while moving the expandable wall 22 translates along the x axis while being held parallel to the frame face 114 moving the upper slide rails continuously repositions pulleys 138a 138c allowing end 216a of cable 140a to descend and end 216b to ascend which simultaneously lowers pivoting ceiling 30 and raises pivoting floor 28 as the expandable wall moves the position of chafing roller 212 also moves allowing the awning 35 to rotate downward chafing roller 212 as well as chafing rollers 136 on pivoting floor 30 eliminate the friction that would otherwise occur between the moving parts similar rollers may be positioned on ceiling.