N.J. Admin. Code § 13:47E-1.2
Weighings made of any vehicle, vehicles or combination of vehicles to ascertain the gross, tare or net weights for commercial purposes or for certification by public weighmasters shall not be determined by any method based upon a procedure known as split weighing, fore-and-aft drafts, axle-load or wheel-load weights, but the gross, tare or net weights of any vehicle, vehicles or combination of vehicles as a single unit shall be determined upon scales with platforms of sufficient size to accommodate the vehicle, vehicle or combination of vehicles fully, completely and as one entire unit; provided, however, that the gross, tare and net weights of a combination or combinations of vehicles may be determined upon a scale which will not accommodate the said combination or combinations of vehicles as one entire unit, when the same may be so separated that the weight of each part can and shall be determined separately as an independent unit and weight slips issued for each such separate weighing; and provided further, that at no time shall a load be placed upon the scale platform that will exceed the legal capacity of the scale.
N.J. Admin. Code § 13:47E-1.2