A system for loading fry bulk materials into a tank trailer includes a blower assembly mounted on a tank truck that is in pneumatic communication with the interior of a tank of the tank trailer through at least one conduit. The blower assembly includes a blower and a blower filter in pneumatic communication with the blower through a suction line. The blower assembly further includes a vacuum gauge for monitoring the vacuum pressure of the airflow between the blower filter and the blower and an optional check valve for passing the airflow from the ambient atmosphere in the event that the vacuum pressure of the airflow exceeds a predetermined maximum vacuum pressure for safe operation of the blower. The predetermined maximum vacuum pressure may be no more than about five inches of mercury vacuum pressure (5 in-Hg; 2.46 psi). An operating vacuum pressure of the blower may be between about seventeen inches of mercury (17 in-Hg; 8.35 psi) and about five inches of mercury (5 in-Hg; 2.46 psi).