We carried two adult mountain bikes on a ladder rack for two years and 20,000+ miles without a problem. Those ladders are strong and the mounting points on the Montana are very strong (could tell you a story that convinced me of that). The only problem was having to dismount the bikes to climb the ladder. I climbed around the rack but couldn't get around the bikes.
Just be sure the lowest point of the bikes is above the rear of the Montana (has to do with my story mentioned above).
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