Ease of towing an 8-ft wide trailer vs a 7-foot trailer

I have found that there are times where a narrower trailer is really helpful – in tight gas stations, in cramped campgrounds, on narrow city streets, in poorly-laid out parking lots, on narrow two-lane roads, etc. But on major highways, I don't think it's as much of a problem. There are some tunnels where size might matter -- Zion, for example. So I guess it depends, in part, on where you are going to travel.