Last week we went skiing and the last two miles of road to get to the resort had been recently plowed but it was ice. The plow was bumping up and down creating 2 to 3 inch dips at 6 to 12 inches apart. It was *brutal* in the P85D with the plus suspension. I'd like to lower the tire pressure for those last two miles if the road is like that again tomorrow. I wouldn't be going more than 5 to 7 MPH and I think it will take the the ice bumps a lot better. I have a portable air compressor int the back that will allow me to restore back to 45 PSI (19" wheels) after I get back down to the bottom of the 2 mile stretch. Any thoughts?