I have the same problem. On my knees to the side of the ladder, I put my right foot on a tread (awkward, to say the least ) and with my left foot on the edge of the cap, holding on to the ladder with a death grip, I stand up and then I am able to put my left foot on the same tread as my other foot.
Every time I succeed in getting down alive and without major injury I celebrate by drinking a pitcher of margaritas. (Note: this should never be done before climbing on the roof).
Dave and Derita
2007 Winnebago Adventurer 38J - 2014 Honda CR-V in tow- Banks PowerPack