I just got back from taking my 28' Weekend Warrior 5'er over the Grapevine from LA to Lake San Antonio. It weighs 10K +. I drove most of the trip in O/D but on the hills had to go to 3rd and on the Grapevine to 2nd. While in 2nd just held it at 2000 rpm about 40 mph. transmission never got over 190...