Hi Sweenja1,
I assume your Bighorn is in a location that's not convenient for you to get a measurement. You should be aware that designs change frequently, so measurements can change.
If you'd like an answer from the factory, I'd suggest you call Heartland Customer Service at 877-262-8032 / 574-262-8030. Have your VIN # ready.
Another owner may be able to help out if you'd share what 2016 Bighorn floor plan you have.