Hey everyone, I'm trying to get my parents F150 pickup ready for the winter. It is rear wheel drive, non 4x4, and only one wheel tire is the drivewheel. Basically, it sucks big time in the snow. I just put 400 lbs. of dirt in the bed of the truck to weigh it down, and yes I will have a purpose for the dirt later lol. Anyways, it seems like I could add more dirt, but I don't want to put too much in and break something. How much weight should I have in the bed to provide maximum possible traction in snow, with regular tires?