we've camped at this park 3 times, you can see the north entrance to Yellowstone from the campground, very nice place. plus you can see how long the line is to the entrance and head out when it clears a bit.
https://www.rockymountainrvpark.com/
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The "Black Pearl"-2017 3731FL Legacy Package
2017 F-450 Platinum, 6.7 PSD