My son and I went looking for a 5th wheel this weekend and indoing so Had a sales man show me what certain trucks could pull. The book said that my 98 12 valve can do 14. 300lbs. My sons 24 valve 2001 can pull 10,000lbs We both have automatic and the same155 rear end I understand that in 98 that some changes were made on the calif trucksI bought mine in november of 97 I dont know of many 98 that are not 24 valve can any one tell me???