Not all but most RV manufacturers actually pay the dealer to do the PDI, Keystone pays the dealer through a warranty claim 2 hours to do the PDI and if I remember correctly most of the other manufacturers do the same. To the manufacturer it is the final step in their quality control as long as the dealer does the PDI properly. Just like the dealer has to eat repairs done in the first 90 days as the manufacturer thinks that it should have been caught during the PDI. Most adjustments are also covered during this 90 day period and not covered after this period. Most dealers will find a way to cover these for the customer for up to a year