This subject came up on the forums earlier this year. Apparently some manufacturer's are leaving the ladders off, most likely for liability reasons.
Here's the thread from the Class A forums:
Where have all the ladders gone?However, you still are required to do periodic maintenance checks on the roof, so that means you have to drag along a separate ladder. In my opinion, I think a ladder properly attached to the side of the RV is safer than an A-frame or lean-to ladder. I know the ladder on my motorhome is pretty securely attached.
Personally, it would be a deal breaker for me. No ladder, no purchase. Perhaps the dealer would be willing to install one?
~Rick
