Denny & Barb,
I recently weighed my 2011 PC 2350 w/o slide at a CAT scale. The front steer axle was 3180 lbs and the drive axle was 7820. Gross weight was 11000. Looking at the Michelin tire pressure chart, I also had a difficult time figuring out the correct pressure for the tires. It does not seem to be an exact science. I decided to go with 70 in all the tires. So far, it seems to be working well for us.
Roni