Chances are the guy with the 5th wheel would not have ended up across the median if he was not overloaded and probably going too fast. I drive I-5 and I-90 a lot and I see too many pickup/trailer combos going 70 MPH plus which is to too fast even if you are not overloaded. I'm also surprised at the number of rigs that are probably overloaded be several thousand pounds. There are a lot of 35' or so 5th wheels, with multiple slide outs being pulled by SRW rigs. My truck is rated to tow about 13800# which is about a 30' trailer with one slide out.
Jim