Graintrailer

The Graintrailer is a hidden towable trailer in Grand Theft Auto V.

Grand Theft Auto V
The Graintrailer is a two-axle trailer fitted with a medium-sized tipper on it, purposed to carry grain. The base structure is composed of a tow hitch with a support beam and the rear features four square tail lights. The trailer is always empty, regardless of its purpose.

According to the files, the only vehicle that can tow this trailer in the Fieldmaster.

Grand Theft Auto V
As a medium trailer, the Graintrailer may increase the weight of the Fieldmaster, reducing its general speed (though rather unnoticeable, as the trailer is not very heavy and the Fieldmaster is generally slow). However, the ground clearance allows it to sort bumpy terrain with no major issues.

Being a trailer, it cannot be driven, however it does feature its own handling line.

Grand Theft Auto V

 * The Graintrailer does not have any spawn location. Therefore, can only be spawned with a trainer.