As stated before, check with factory. My dealer said no to the ladder, checked at factory while on tour. For the 2012 Flagstaff txt the blocking was added to all the tts. Have had the ladder added since touring the factory. Also carry a little Gaint knock off I got at Lowes on sale. Comes in handy for cleaning off slides and upper running light work.
Marriot2 on Wheels 2017 Flagstaff Classic 832 OKBS
2013 GMC Denali 6.6L 2500 HD DMAX w\Alison Trans
Pepper Pomeranian rescue 101 days as camping buddy
Days camped in FR, 2011 = 20, 2012 = 57, 2013 = 59
... 2014 = 39, 2015 = 52, 2016 = 68, 3 more planned