A cargo tank assembly can include a cargo tank, and a plurality of access ports for the cargo tank, including a manway. A cabinet can be arranged to provide ground-level access to the plurality of access ports. In some embodiments, the cabinet can provide a sole breakable seal for a set of equipment, or for the cargo tank.

Systems and methods to vent a tank to enhance transporting asphalt when positioned in the tank may include connecting a vapor box to a tank. The vapor box may include one or more vents apertures and a valve associated with the one or more vent apertures and positioned to provide fluid flow between the interior of the vapor box and the exterior. The systems and methods may also include communication via a selector with the valve to cause the valve to switch between an open condition and a closed condition. The selector may be located remotely from the valve, and the systems and methods may also include communication with an indicator via one or more of the valve or the selector to provide an indication of one or more of the valve in the open condition or the valve in the closed condition.

A tank trailer is provided. The tank trailer includes a tank having an interior volume adapted to contain fluid, and a manhole extending through the tank and positioned proximate a rear portion thereof and proximate to ground level. The tank trailer also includes a ventilation system having a ventilation interface communicating with the interior volume of the tank, a ventilation access port having a ventilation outlet positioned proximate the rear portion and proximate to ground level and a ventilation pipe adapted to establish fluid communication between the ventilation outlet and ventilation interface. The tank trailer further has a collection system which includes a collection pipe coupled between the ventilation interface and the ventilation pipe. The collection pipe defines an internal volume shaped and adapted to collect fluid spilling from the interior volume of the tank through the ventilation interface and at least partially prevent fluid flow into the ventilation pipe.

Systems and methods to vent a tank to enhance transporting asphalt when positioned in the tank may include connecting a vapor box to a tank. The vapor box may include one or more vents apertures and a valve associated with the one or more vent apertures and positioned to provide fluid flow between the interior of the vapor box and the exterior. The systems and methods may also include communication via a selector with the valve to cause the valve to switch between an open condition and a closed condition. The selector may be located remotely from the valve, and the systems and methods may also include communication with an indicator via one or more of the valve or the selector to provide an indication of one or more of the valve in the open condition or the valve in the closed condition.