The above last few posts reminded me of something the DW and myself experienced decades ago in Montana:
We were driving harmlessly along in our Mustang at about 50 MPH or less on a two-lane road out in the beautiful summer Montana countryside.
Suddenly I noticed a sign that said something like "Caution - Roadwork". Way at the last minute my eyes figured out that the sign had been set up only about 15 feet from where the road was no more. I put the Mustang into a four point full-on skid and managed to stop about 5 feet from the two foot dropoff onto rough earth where the complete surface of the road had been removed.
I shudder to think what would have happened in a motorhome in an unexpected emergency like this .... maybe a roll-over?
You can't play the odds regarding what humans may or may not do, or with the laws of physics. Slow as you go is the name of the game in a motorhome. To do otherwise is ludicrous, IMHO.