I'm no heavyweight, but I don't use wraps or a belt (never mind a suit), and I use a wide stance.
My knees are really touchy, and always have been. Left one got worse after taking a slapshot at close range while playing goal back when I was a kid. Using a narrow stance for standard squats invariably screws my knees up.
For some reason, though, I can get away with a narrow stance for front squats so long as I'm very thorough in warming up.
For standard squats... I had to get the base of my power rack flattened so it wouldn't interfere with the spread of my feet. (I'm about 6'2"/6'3") I find the trick is in making sure I'm adequately warmed up, that I keep my hips and hams flexible and limber, and that I pay close attention to keeping my body tight and controlled all the way down. Knees and hips come out of it just fine.