When I added it to my insurance with my 2013 Nissan Frontier it basically doubled almost exactly. Then when I took the Nissan off it only cut down by a third so I guess there was a multi vehicle discount.
I’m 6’5” tall and 340lbs and I have no issues with space. I can fit 4 fingers between my head and the ceiling and I have tons of room between my knees and the dash.