A mounting system for securing a container to a bed of a vehicle or other installation location, the mounting system comprising: a first arm configured to couple a first side of the container to a first sidewall of the bed; a second arm configured to couple a second side of the container to a second sidewall of the bed, the second sidewall of the bed facing the first sidewall of the bed; wherein each arm (12, 14) comprises: an arm body having a length dimension, the arm body of at least one of the arms (12, 14) being adjustable in the length dimension; a first joint for pivotally attaching a first end of the arm body for pivotal movement relative to one of the first or the second sidewalls of the bed; a second joint for attaching a second end of the arm body for pivotal movement relative to one of the first or the second sides of the container; wherein each arm (12, 14) is pivotally moveable relative to a respective one of a first and second sidewalls of the bed when the arm (12, 14) is attached to the respective one of the first sidewall and the second sidewall of the bed through the first joint and is not attached to the container at the second joint; and wherein the arm body of each arm (12, 14) is adjustable in its length dimension to a length that inhibits pivotal motion of each arm (12, 14) when the first end of each arm (12, 14) is pivotally attached relative to a respective one of the first sidewall and the second sidewall of the bed at the first joint and the second end of each arm (12, 14) is attached to the container at the second joint. a first arm configured to couple a first side of the container to a first sidewall of the bed; a second arm configured to couple a second side of the container to a second sidewall of the bed, the second sidewall of the bed facing the first sidewall of the bed; wherein each arm (12, 14) comprises: an arm body having a length dimension, the arm body of at least one of the arms (12, 14) being adjustable in the length dimension; a first joint for pivotally attaching a first end of the arm body for pivotal movement relative to one of the first or the second sidewalls of the bed; a second joint for attaching a second end of the arm body for pivotal movement relative to one of the first or the second sides of the container; an arm body having a length dimension, the arm body of at least one of the arms (12, 14) being adjustable in the length dimension; a first joint for pivotally attaching a first end of the arm body for pivotal movement relative to one of the first or the second sidewalls of the bed; a second joint for attaching a second end of the arm body for pivotal movement relative to one of the first or the second sides of the container; wherein each arm (12, 14) is pivotally moveable relative to a respective one of a first and second sidewalls of the bed when the arm (12, 14) is attached to the respective one of the first sidewall and the second sidewall of the bed through the first joint and is not attached to the container at the second joint; and wherein the arm body of each arm (12, 14) is adjustable in its length dimension to a length that inhibits pivotal motion of each arm (12, 14) when the first end of each arm (12, 14) is pivotally attached relative to a respective one of the first sidewall and the second sidewall of the bed at the first joint and the second end of each arm (12, 14) is attached to the container at the second joint.