I'm going to be hauling firewood and I don't want to overload my truck. Since I'll have to guesstimate how much wood I'm loading up in the forest. I'm cutting green western juniper which weights between 3500-4000 pounds per cord so two cords would be the maximum. How close from the rear axle bumpers to the axles should I load it. On my Silverado I always leave around 3 inches clearance but it's a lot smaller truck. Anyone have any input