Totaled my fifth wheel, how to work with insurance adjuster

Yes, I'm near Albuquerque. There's no debate the other driver was at fault, apparently there were lots of witnesses. We were knocked out and don't remember anything about the accident, woke up in the hospital.

I was told we could go through our insurance and they would turn around and get reimbursed by his insurance company. I thought our company would be more sympathetic to us, apparently not. I'm going to start negotiating with his company.