I'd have to try that out, but you could use bridge markers to let units 'climb up' ladder props. This is how the orcs access their walls. If you remember our editor showcase, invisible bridges can be used for pretty much anything - including walking on water and in the air. And soon enough, we'll have ladder-carrying units involved in siege (had to take them out for a while to fix some pathfinding and connection issues).
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"The sky grows lighter my friends. The break of day should cheer the heart. But for us, sunrise brings only bloody war. Make thou ready. Defend my people well." - Prince Erian IV, Dawn of Fantasy