You said 2 lane, 1-way bridges. Why wouldn’t that be wide enough? Regardless, if width is an issue, I’d wait to cross when there’s no other traffic, or as David does, just move to indicate to followers that you intend to hog both lanes.
We once crossed a busy Washington bridge, Snohomish area I think, with our old 8’ wide Pace Arrow and tweaked the right mirror on a girder as I sashayed away from an oncoming semi. Mirrors stick out more than the coach’s 8.5’. Your mirrors can be adjusted inward via the arms, and still see adequately by adjusting their swivel.
More of a concern should be bridge capacities. Tunnel edge heights and bridge limits can usually be found in the Trucker’s Atlas, commonly available at truck stops and probably Amazon. I check it before entering a new State, and write down any warnings it mentions in case we plan on traveling anywhere near a low/narrow tunnel, low overpass, low-load bridge, or any other avoidable hazard. Truckers’ apps and GPS features like Mike mentions are also advisable.
Joel