Note:
The default chassis not adapted for heavy hauling
Edit the chassis.sii in def folder if you wanna make it adapted for heavy hauling
kerb_weight[0]: 6500.1
kerb_weight[1]: 5050.1
kerb_weight[2]: 5350.1
kerb_weight[3]: 5385.1
kerb_weight[4]: 5385.1
Credits:
Ben Affhandy, DANZ [D3S DESIGN], dobr4060