PoR has very few levels where mounted units don't have a lot of advantages. RD brings them down to the level of everyone else.
Biscuit, are you trying to go up one side or are you splitting your units on each side? I don't know about everyone else, but I found it to be a lot easier if I only went up the left side. Then I went down the right and didn't have to worry about those rocks at all.
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~Peaf~
"Later that day, I f***ed a panda." - PSO