This depends on the CR model line or year. The new SunsetTrail models do not have a walk-on roof so they donot factory install roof ladders. I would question why yours did not come factory installed. Please be aware that all RV manufacturers disclose the construction standards can change without notice. I would encourage you to also question if youcan add a slide out topper awning if you select to do so.As one member found out that the blocking for the mounting of these awning is no longer installed on the Zinger line.
Sales staff are not always aware of the latest construction modifications at the plant, so forcethem contact their Crossroads account rep to validate that adding a ladder won't void the warranty. Don't want to scare you, but you mentioned that you are first time buyers. My first time I almost bought something that wasn't what I was lead to believe and I found the truth through a forum like this.No one was more surprised at the construction changes than the dealer sales staff. I was able to back out of the deal and then find something we were 100% satisfied with. For instance, the Z-1 line has OSB floors and there is now partial OSB floors in the Cruiser line. Before you sign the final delivery papers in April, make them pull a heater register from the floor and prove its plywood. Once you take delivery, it's yours for keeps.
As they say, it never hurts to ask, butit hurts when you don't ask. I hope all of your questions are answered to your satisfaction and the Zinger is the perfect fit.