A device for determination of positioning for cargo consisting of a number of separate cargo units (3, 4) on a freight vehicle provided with a number of wheel shafts (1, 2), which device comprises at least one weight sensor (6, 7, 59), a process unit and signal means (8, 9, 13) for conveying from each weight sensor (6, 7, 59) to the process unit signals (8, 9, 13) representing data from the respective weight sensors (6, 7, 59), which process unit comprises receiving means (55, 58) for receiving said signals (8, 9, 13), storage means for storage of data from a sequence of signals (8, 9, 13) from each weight sensor (6, 7, 59), and processing means for processing of said data, wherein said at least one weight sensor (6, 7) comprises a number of weight sensors (6, 7) provided on the vehicle and adapted to detecting the vehicle's load, including that of its cargo, upon the respective weight sensors (6, 7), and wherein at least one weight sensor (6, 7) is provided at each wheel shaft (1, 2), characterised in that F and R denote weight detected at respective wheel shaft (1, 2), wherein the processing means are adapted to generating output signals to a data presentation device which is adapted to show information on how far one or more of said cargo units (3, 4) should be moved from an original position in a longitudinal direction in order to fulfil a specific load distribution criterion and wherein said information is provided by: loading the vehicle with a first cargo unit on a load platform of the vehicle, transmitting via the signal means (8, 9) to the process unit the values of F and R, the process unit thus receiving information about the weight of the first unit, and the process unit having information pre-programmed in it about the vehicle's deadweight on each wheel shaft (1, 2), using the information about the respective values F and R to calculate an x coordinate of the first cargo unit, which represents its position in the longitudinal direction, placing a second cargo unit on the load platform of the vehicle and calculating an x coordinate of the second cargo unit in the same way as for the first cargo unit, the weight sensors (6, 7) indicating current values of the forces F, R on the respective wheel shafts (1, 2), calculating set-point values of F and R according to the specific load distribution criterion, using these set-point values to calculate where the second cargo unit needs to be positioned to fulfil the specific load distribution criterion, leading to a set-point value for the x coordinate of the second cargo unit, wherein providing information about how far the second cargo unit should be moved to fulfil the specific load distribution criterion based on the knowing of the current value of the x coordinate of the second cargo unit. loading the vehicle with a first cargo unit on a load platform of the vehicle, transmitting via the signal means (8, 9) to the process unit the values of F and R, the process unit thus receiving information about the weight of the first unit, and the process unit having information pre-programmed in it about the vehicle's deadweight on each wheel shaft (1, 2), using the information about the respective values F and R to calculate an x coordinate of the first cargo unit, which represents its position in the longitudinal direction, placing a second cargo unit on the load platform of the vehicle and calculating an x coordinate of the second cargo unit in the same way as for the first cargo unit, the weight sensors (6, 7) indicating current values of the forces F, R on the respective wheel shafts (1, 2), calculating set-point values of F and R according to the specific load distribution criterion, using these set-point values to calculate where the second cargo unit needs to be positioned to fulfil the specific load distribution criterion, leading to a set-point value for the x coordinate of the second cargo unit, wherein providing information about how far the second cargo unit should be moved to fulfil the specific load distribution criterion based on the knowing of the current value of the x coordinate of the second cargo unit.