Another stupid prob that has me stumped. Picked up a nice re import Wh20. PF will not click into service mode...Looking at the side brackets they both have springs, the little metal posts are correct on the cab. What is happening is when I pull pf to lock its hitting the back support brackets on pf before it can engage locks on the brackets. Kind of puzzled because there is no adjustment...Have heard wh20 used an earlier version of the slide brackets and a friend had had similar issue. Anyone else have problems with wh20? Or if you could take a pic of the bracket position just as you lift pf it will tell me the brackets are angled correct to start.