The problem that I have with the permanently attached ladders is getting on and off at the top. I am a pretty big guy, and feel really awkward trying to get onto the roof from the ladder, or onto the ladder from the roof.
I got a telescoping ladder that extends up beyond the edge of the roof so I can just step off the ladder onto the roof while holding onto the top of the ladder. Other advantages are that the ladder can be placed at a more convenient angle for climbing, it can be moved around the trailer as necessary to reach other things, and the DW can hold the bottom for me.
It folds up neatly, and stores under the bed or in the back of the van.
http://www.amazon.com/12-5Ft-Aluminu...escopic+ladder
The downside of not having a permanent ladder, is those things are a good place to store things like bikes or blue sewer totes.
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Bill & Kate with Zeke (parti-poodle) & Bailey (std poodle)
Stone Harbor, New Jersey
2014 Forest River Wildcat 272RLX Fifth Wheel
2018 F-250 4x4 Crew Cab 6.2L Gasser