Systems and methods for conducting multi-item auctions for complex goods that allows bidders to specify budget constraints is disclosed. The two sections are removably attached to each other by way of a dove tail arrangement. The mobile services operator provides mobile communications services for the mobile users in return of receiving the marketing messages. A temperature trim loop measures engine temperature to determine the onset of a possible over-temperature condition. The substrate containing glass forming raw materials may be formed so as to have a Young’s modulus of 110 or higher. The apparatus may be used to lift and level a recreational vehicle.