Rolling tarp enclosure system

A movable carriage for a movable, tarp enclosure system having a tarp cover, support rails, a plurality of substantially U-shaped or semi-circular-shaped bows connected to and supporting the tarp cover, and a plurality of the movable carriages connected to lower ends of said bows and which move along the support rails, the movable carriage comprising:

• a main body;
• plural primary support wheels connected to the main body and configured to engage and roll along the support rails while supporting the movable carriage;
• at least one stabilizing wheel connected to the main body, the at least one stabilizing wheel being smaller than the primary support wheels and configured to engage the support rails for stabilizing or aligning movement of the movable carriage as it moves along the support rail supported by the primary support wheels;
• and
• a housing to which the at least one stabilizing wheel is rotatably secured,
• wherein the housing is provided with one of a guide track and a channel which securely and sliding receives the guide track therein, the main body is provided with the other of the guide track and the channel, and the housing is secured to main body by engaging the guide track within the channel.