Another vote for Duratracs. They are great in mud and snow, and have worn reasonably well on my Tundra. I've had no issues with loading up the bed and/or towing a 6000 lb travel trailer, but IMO they do need to be run at 42 psi or so to avoid white knuckle situations up and down the mountains and squishy handling.
Do you really mean 42 PSI ? Are the C or D rated? I had E rated on my truck run at 75PSI. I was at about 16,000 #'s with truck, camper and 3 horse slant loaded.Made for some tight pucker a times.
Like posted for a 1/2 ton,probably no problem.
