Setting aside for the moment the awfulness of the likely-drunk individuals who caused all this mayhem, there is a lesson hidden in this story. If Mr. Lounsbury was unable to avoid the collision in front of him without crossing over the center line himself (admittedly it is somewhat unclear from the story, hence the use of if), then he was driving too closely behind Ms Sales.

There could be lots of reasons why he was following too closely. Perhaps he rarely drives an RV with a tow and just forgot about the much longer stopping distance it has relative to other vehicles. Perhaps he never even knew about the stopping distance issue. 

Either way, we really should require additional training to drive RV's on the road. There is no way they should be treated as just another class C vehicle. There's a world of difference between driving one of those, particularly when towing another vehicle, and driving a car, both in terms of skills and knowledge.