A system can include a trailer, a tarp roller, a tarp, and an arm for translating the tarp roller across the trailer. An arm can be attached to a mount disposed on a door of the trailer. The arm can include a rigid arm segment to attach to the mount and a flexible cable and a universal connector to connect to an intermediate position on the tarp roller. An arm can include a longitudinally extending rigid arm segment having a first longitudinal axis, another longitudinally extending rigid arm segment having a second longitudinal axis, and a connector coupling the rigid arm segments together. The connector can include attach points where ends of the rigid arm segments attach to the connector. The connector can also have biasing mechanisms at the attach points to urge the rigid arm segments into an orientation. A stop can include a frame with a tab.