Abstract: An expandable shelter having an expanded configuration and a collapsed configuration in which the shelter has the approximate dimensions of a standard International Organization for Standardization (ISO) freight container. The expandable shelter includes first and second substantially parallel corner posts disposed at a first end of the shelter. The expandable shelter also includes a ramp coupled with hinges at the first end of the shelter and is configured to fit securely on the interior of the first and second corner posts when in a closed configuration in which the ramp is disposed between the first and second corner posts. The expandable shelter has sufficient strength to withstand the forces of at least eight similar shelters stacked on top of the shelter.

Abstract: An exhaust brake for an internal combustion engine is disclosed. The exhaust brake includes a main valve and a bypass valve for restricting the flow of exhaust gas. The main valve may be selectively closed, while the bypass valve is biased into a closed position with a selective biasing force. Closing the main valve may cause exhaust back pressure to build against the bypass valve until the biasing force is overcome. When the biasing force is surpassed by the exhaust back pressure, the bypass valve opens to relieve the back pressure. The bypass valve closes when back pressure falls below the biasing force. The biasing force may be varied to operate the exhaust brake at a maximum back pressure for a given engine speed and/or engine condition. A method of operating the exhaust brake is also disclosed.