Parker 2500 Gravity Wagon Weight Correction

This mod corrects the weight of the Parker 2500 gravity wagon. The original empty mass was approximately 3,500 kg (7,716 lb). After reviewing, the correct empty weight should be around 1,134 kg (2,500 lb). The empty mass has been updated accordingly, with the component weight split proportionally as follows: 648 kg, 324 kg, and 162 kg. For corn, with an estimated 12,334 liters using 56 lb/bushel and approximately 35.24 liters per bushel, the estimated corn load is about 19,600 lb (8,890 kg). The corrected total loaded weight is about 22,100 lb (10,025 kg), including the empty wagon and corn load.