This 2011 Appco oilfield trailer — also commonly referred to as a sand storage pig or dry bulk tank trailer — is a purpose-built unit designed for the storage and discharge of proppant materials used in oilfield hydraulic fracturing operations. It combines bulk storage capacity with an integrated conveyor system, allowing proppant such as frac sand to be transported to site and discharged in a controlled, efficient manner.
The trailer offers 4,000 cubic feet of total storage capacity, divided across four individual proppant compartments separated by corrugated sidewalls. This compartmentalized layout allows operators to manage different material grades or volumes independently. A 24-inch underbody conveyor belt system runs beneath the compartments, channeling material to a rear-mounted discharge chute for controlled delivery.
The conveyor is powered by a Caterpillar C4.4 diesel engine, a compact four-cylinder industrial powerplant well regarded for reliability in oilfield support equipment. The engine currently shows 3,611 recorded hours of use. A self-contained hydraulic power pack drives the system's hydraulic functions, which include hydraulic landing gear, hydraulic leveling, and hydraulic controls throughout — reducing reliance on external power sources and making the unit operationally independent once on site.
The trailer rides on spring suspension and is fitted with aluminum wheels shod with 11R 22.5 tires. The gross vehicle weight rating is 55,000 kg (121,250 lbs). The unit is located in Montana, USA, and is offered in used condition. Multiple units are available.
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