Welcome to camping! Sorry I don't have access to my camper at the moment, but when I get home tonight I'll try to remember to make the measurement (we have the same model). Feel free to message me as a reminder in case I forget :-) .
In case you don't have the info: the camper uses a 2 inch ball. You can also get an adjustable hitch...I use this unit:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
When towing with the Colorado (truck), the hitch pin for the ball is set to the top hole. When we tow with the Durango (suv), it gets lowered by one hole. So, if you concern is getting the camper level (as I was when I first bought mine), then an adjustable hitch might be just the thing.
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2021 Rockwood Freedom 2318G
Escape Trailer Industries 21C
2022 Chevrolet Colorado LT V6
2019 Dodge Durango Citadel 5.7l