Sandbags in pickup bed, placement?

If you want to be able to go in the snow just get a set of tire chains. I keep a set in the back of my 2 wheel drive F-150 and they have gotten me where I have always need to go. I live in the mountains and have gone up some pretty steep roads with 10 inches of snow, had nowhere to park, parked in the yard with 10 inches of snow, backed out, and drove away later with no problems. I have surprised people with where I could go with a 2wd and chains