Might be true ... This is what I have for Surveyor ...
When I was touring the factory and getting my trailer fixed in January I inquired about the ladder addition. They basically told me that the support for a ladder for my trailer was in place and that they do nothing special for the ladder, but, they see all kind of botched attempts done on units if they did not come with factory ladder. basically the message I got was, if it did not come with it, and you get it done somewhere else , be ready for leaks cracks etc.
They offered to install one on the spot but I couldn't do it at the end of a three week long trip
Congratulations on your unit and good luck with the ladder .... It would be well worth your while to get in touch with the factory and MAKE sure that there are supports for the ladder before you let anyone make holes in your brand new trailer.