Yeah, probably 5 hours from Sheffield, even without stops. I wish they'd do a northern version, although probably never going to happen as would clash with Leeds.
I haven't stayed in the Domo camp but I'd say that's a great call, when I went we brought tents on the plane and it was a whole ordeal.
The festival itself is gorgeous, lazy days by the river, excellently curated line up, I definitely want to go back sometime!