In some embodiments, the present disclosure provides an exemplary adjustable mobile structure system including an outer hardshell having two halves connected on a first side by at least one support hinge, a handle on a second side opposite the first side, the handle having a cross-sectional shape defined by a perimeter with two parallel sides and a cross-sectional width having an outward facing curve; and a removable ladder apparatus having a locking mechanism affixed to a distal end of the removable ladder apparatus, the locking mechanism configured to secure a connection between the removable ladder apparatus and the handle, where the locking mechanism includes at least two members, each member having a shape to form a circular interior cavity capable of matching a curvature of the handle.