Here are the spec on the tires.

http://www.tirerack.com/tires/tires.jsp?...1&tab=Specs

As far as the rear shocks they were not made for the truck but have the same sizing as other replacements so they fit without any modifications just bolted on.But they may be just to stiff and not the right suspension curve for the X but they keep it level when towing which is only a 18 foot flats boat!

Tire pressure is 35 front & rear on the door panel but I think running them that low they feel the best no vibrations but the truck feels slugish and i don't think they will wear right!

My take is to replace the rears with Bilsteins and see what happens leave the front KYB gas adjust on the fronts and see what happens then replace the fronts with Bilsteins if it's not riding right then!