(As I recall, Yellowstone is not a hard park, towing-wise. Grades and altitudes are moderate. Nothing like the high Sierras or the Rockies further west.)
There are some rather high passes in and around Yellowstone. Bear Tooth Pass weighs in at 10,974 and several other areas are up in the 9000 foot range. The Absaroka Range forms the eastern border of the park contributing to the altitude. You would definitely want to drop your trailer before making the loop around the park.
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