Yep...unpublished option and it was about $1300.00 on my CT31RL, not sure what price would be now as it has been 1.5 years since ordering. I am REAL happy with the cold and hot weather properties of these windows. Well worth it.... I have camped in weather in the upper 20's and the electric disc furnace kept the camper above 67-degrees until about 3:00 a.m., even with some wind. After that furnace only ran about 2-more times until morning...
2015 Rushmore Springfield
Disc Brake upgrade, Goodyear G614 tire upgrade
RV FLEX-ARMOR roof, Mor-Ryde IS suspension
2017 F350 Dually 4x4 6.7 Bronze Fire