Patent ID: 7503268

Claim:
An apparatus comprising: a trailer including a frame having a pair of opposite side members extending in a longitudinal direction of the trailer; a pair of independent wheel axles extending one from each of the pair of side members, whereby space between the pair of side members is unoccupied by the pair of wheel axles; a pair of wheels mounted one to each of the pair of wheel axles; a firebox arranged between the pair of side members; an air curtain manifold mounted along a top edge of the firebox; a fan mounted on the trailer frame; a duct system communicating from the fan to the manifold; and suspension means for raising and lowering the firebox relative to the pair of side members, the suspension means being operable to lift the firebox off of the ground and to set the firebox onto the ground while the duct system maintains communication between the fan and the manifold, wherein the suspension means includes a winch fixed to the trailer and at least one cable connecting the winch to the firebox, wherein the at least one cable consists of only a single cable double-wound on a drum of the winch, the single cable being attached to opposite sides of the firebox.