Truck tows a lot more then 10tons. I guess make sure the weight is distributed properly. I'm still messing around with it but I'm not having issues towing heavy equipment. 
ya still not good i looked it up a 2020 ford f450 limited dually irl can tow 24,200 pounds witch that is 10 tons and my 2016 ford mod can tow better my mod still sags but not as much as yours does and just like he said a 2025 f450 irl can tow 40,000 pounds also i have the same setup except the truck towing my truck is still better build better mods 