Moss Man
Addicted to ArboristSite
To address the weight being pulled by any truck.
I am almost always over my rated towing capacity for my truck. I haven't had any problems. The manufacturer I believe rates the towing capacity like if a moron was behind the wheel mashing the pedal to the floor at every stop. I simply take it easy and slow from stops, keep it out of overdrive, and move right along.
I have a 2004 F250 with 5.4L and automatic. I pull a 10ton gooseneck which has never been to capacity behind my truck, but I have had the combined weight near 20k.
Do what you wish, but I wouldn't have any problem pulling a 10k or 14k trailer behind a half ton.
Your style of heavy vehicle use mirrors mine, I have always been on a budget and using a vehicle harshly has never neen an option. I milk older vehicles for all they are worth and when I sell them the new owner usually trashes them within months.