What do you mean, truck 8+8 and 8+5? Thanks a lot, little brother
Look at the frame, has two layers, the outer layer is main girder, are generally 8 thick, the inner layer is a secondary beam, beam not so long, to a smaller, 8 thick, 7 thick, 5 thick, 4 after several, you can measure the actual. There are three - story frame, three - story frame used in dump truck, that is, in the upper two layers plus a sub - frame, are generally used for heavy load.
These data refer to the relevant section of the frame size is 380, the total cross section 80 is high, the total width of 8+8+5, that is three layer frame, three layer thickness of the steel plate are respectively 8, 8, 5 (that is often said that the side beam and girder, girder 8 thick, two side beams are respectively 8 and 5 a thick). The reference is shown in the picture, more than double the frame of heavy truck, such as 320X90X (8+7)