Generator exhaust from below can get into RVs under right circumstances. There have been reports on this forum of exhaust getting inside motorhome through slide seals which set off alarm. Any other opening could result in same problem with right wind conditions.
At football games I've been attending this year, RVs are not allowed to run a generator unless they use a Venturi discharge above roof elevation. If you were going to do this often, I'd look into one of these exhaust extensions.
Needless to say some people don't follow rules which caused us to have to move to a different location because the wind was blowing generator exhaust from a nearby RV into our van. It wasn't enough to trip our alarm but we could smell unburned gasoline fumes. Unfortunately, generator exhaust is not as clean as automotive exhaust.
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