For me at 6ft. 315lbs I'm afraid to use my onboard ladder for this very reason.
I have a 22ft Little Giant at home for getting on top, but ask on the Thor Miramar/Challenger Owners Group on Facebook what they use for a take along ladder, and a collapsible round tube style seemed to be the most popular choice.
Planning on ordering this one with a Max length of 16.5, and weight capacity of 330lbs. I should be ok, I hope !
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