A portable storage device to contain fuel. The device is designed to be relatively light-weight to allow for movement around a fueling facility, and to be delivered to the fueling facility through the air. The device includes a number of separate tanks each configured to contain fuel. A suspension protects the tanks by absorbing external forces that could occur in the event the device is dropped during air delivery.

A ground-level access operating system for a tank trailer. The ground-level system includes a cleaning/washing device, a venting device, an inspection access port, and device for loading/unloading the compartments. All devices in this system are located on the side of the semi-trailer, within an operator's reach on the ground. The devices locations are meant to be reachable to ensure operator safety. The operator of the trailer can execute all work without having to reach the top of the tank. Both of venting and cleaning/washing devices have their access port on top of the tank but are hooked up at a position proximate ground level, for an easy-to-reach operation and inspection by on operator on the ground.

A trailer configured to lower an overall center of gravity thereof. The trailer comprises a tank, a wheel assembly, a height and a length. The tank comprises a cavity contained within a lower body, a tilted body, a front end and a rear end. The lower body comprises a lower body height, a lower body length, a lower body ground clearance and a lower center of gravity. The tilted body comprises a tilted body ground clearance, a tilted body length, the height and a tilted portion center of gravity. The tank comprises the length, a height equal to the height of the tilted body, and a ground clearance equal to the lower body ground clearance.

A cylindrical cargo container is formed of longitudinal, extruded arcuate panels joined pairwise at abutting edges to form a cylindrical tube. The container is mountable on a separate wheeled chassis to form a semi-trailer or railcar, or a chassis integral with a truck. The container may be substantially smooth on inner and outer surfaces, to provide optimal aerodynamics and freedom of motion of cargo within the container. The panels may have inner and outer skins bridged by multiple webs. Such structure may provide protection from punctures to the outer or inner skins. The container is useful to transport waste including municipal or industrial waste, and may be part of a tipper trailer. The container, trailer, truck, or railcar may be used with a compactor for compacting the waste within the container.

A dry bulk tank and a method of carrying a load and discharging a load therefrom. The dry bulk tank includes a tank assembly having a first wall that bounds and defines a first compartment for carrying a load therein and a second wall spaced outwardly from at least a portion of the first wall; wherein a second compartment is defined between the first wall and the second wall. The tank assembly includes an air piping system that is selectively actuated to place the first compartment and the second compartment under equal air pressure. In one example the air piping system pumps air into the first compartment and the second compartment. In another example the air piping system evacuates air from the first and second compartments.

A method of manufacturing a cylindrical cargo container includes: providing a plurality of rigid panels together formable into a cylindrical shell; forming a first semi-cylindrical shell from a first set of the panels; forming a second semi-cylindrical shell from a second set of the panels; forming the cylindrical shell from the first semi-cylindrical shell and the second semi-cylindrical shell; forming a collar conformably encircling the cylindrical shell; constricting the collar to compress joints formed at abutting edges of pairs of adjacent panels; rolling the cylindrical shell and collar to bring respective joints of pairs of panels to a lower position, and welding an inside seam of the joint when at the lower position; removing the collar from the cylindrical shell; and rolling the cylindrical shell to bring respective joints of pairs of panels to an upper position, and welding an outside of the joint when at the upper position.

A tank trailer includes front, rear, and transition sections. The front section has a front frame having a front-frame front end, which is at a front-frame height above a surface upon which the tank trailer rests, and a front-frame rear end. The front section includes a cylindrical front barrel coupled to the front frame and having a front-barrel diameter and a front barrel length. The rear section has a rear frame having a rear-frame front end and a rear-frame rear end, which is at a rear-frame height above the surface, and a cylindrical rear barrel coupled to the rear frame, which has a rear-barrel diameter and a rear barrel length. The transition section includes a cylindrical transition barrel coupled to the front barrel and to the rear barrel and a transition-barrel diameter and a transition-barrel length along a transition-barrel height. The front-barrel diameter is the same as the rear-barrel diameter.

A dry bulk tank and a method of carrying a load and discharging a load therefrom. The dry bulk tank includes a tank assembly having a first wall that bounds and defines a first compartment for carrying a load therein and a second wall spaced outwardly from at least a portion of the first wall; wherein a second compartment is defined between the first wall and the second wall. The tank assembly includes an air piping system that is selectively actuated to place the first compartment and the second compartment under substantially similar or substantially equal air pressure. In one example the air piping system pumps air into the first compartment and the second compartment. In another example the air piping system evacuates air from the first and second compartments.

A ground-level access operating system for a tank trailer. The ground-level system includes a cleaning/washing device, a venting device, an inspection access port, and device for loading/unloading the compartments. All devices in this system are located on the side of the semi-trailer, within an operator's reach on the ground. The devices locations are meant to be reachable to ensure operator safety. The operator of the trailer can execute all work without having to reach the top of the tank. Both of venting and cleaning/washing devices have their access port on top of the tank but are hooked up at a position proximate ground level, for an easy-to-reach operation and inspection by on operator on the ground.

A tailgate assembly for a roll-off container includes a tailgate hinge that is operable to attach a tailgate to a container such that the tailgate is movable between an open position and a closed position. A sealing material located between the container and the tailgate when the tailgate is in the closed position.