I'm a little puzzled at the need for extra weight in the back. A couple of years ago I went from Sacramento to Eureka on a snowy night. US101 was closed so I went thru Redding on SR 299. There were four ridges that had chains required except for 4X4s. In one case there was at least a foot of snow on the road. I had no trouble at all with no weight in the bed. The only stop I made was to get a sandwich in Weaverville. Just went along and shifted the transfer case in and out as required. Lots of ice on the road too. The truck seemed as sure footed as a cat.