I don't go on many rides with quads on them but the few I've met have never been any more of a problem than the average bike rider. There will always be slower and faster riders / quads to work around but all you need to do is either pass safely or take a 5 minute breather while they trundle on their way, it's about a fun (usually family) event not a race.
Everyone just needs to ride relaxed and aware and 90% of the problems disappear.
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