Sad, very sad. Don't blame the SUVor the tires, could have been a car with blizzaks with same result. Their time was up. I don't know why they got sucked into the slush but that was the begining of the end. Their luck went down hill from there. Unlucky they clipped the cube van, from all traction was lost (4wheel skid) and their fate was seal. No driver training would have saved them.
Yes they could have slowed down, or stayed home, who knows the roof could have collasped.
I just find people are quick to pass judgement. Their time was up.RIP.