Mine came with a ladder and I've been up on the roof about a dozen times in the last week, including the PDI. I also have a service tech up there installing the Fantastic Vent.
If I'm not supposed to be up there walking around, you'd think it would be displayed VERY prominently in the owner's manual and some sort of warning tag somewhere.
EDIT: Just reviewed the CR owner's manual and, for walking on the roof, it simply states "Use caution when walking on or loading articles on the roof" (page 50). There is further instructions that indicated periodic inspections of roof mounted items and guidance on cleaning the roof.
Jeff & Laurie -- Full timing in Rockport, Texas
Auggie (our beer-loving English Cocker Spaniel)
Angus (55 pounds of attitude in a 5 pound chihuahua body)
Our home base -- 2018 Grand Design Solitude 375RES -- The "Uno Mas!"
The mobile office -- 2016 Crossroads Hill Country HCT26RB -- The "Poquito Mas!"
Gone but not forgotten: 2015 Heartland Landmark 365 Key West (lost to Hurricane Harvey)