In an agricultural conveyor, an auger housing is formed of modular tube sections and an inline drive assembly for driving rotation of the auger member relative to the auger housing which is connected in series between the modular tube sections. The auger housing is supported on an adjustable carriage frame for transport. The auger housing is supported on a portion of the carriage frame by a roller assembly having rollers engaging diametrically opposed top and bottom sides of the auger housing for rolling movement along the auger housing. The connection between at least one adjacent pair of modular tube sections is arranged to allow the roller assembly to roll across the connection along the length of the assembled auger housing.