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A quick Google reveals 2 miles high or so. There must be some weird geology going on on Pluto!

For reference, that's roughly the height of Glacier Peak in Washington.

guessing less atmosphere = less erosion

Less gravity too.

I wonder what the tidal forces are like in the Pluto/Charon system.

Pluto and Charon are mutually tidally locked, meaning they always show the same face to each other. So the tidal forces would be very constant.