Answer to previous skill testing question is c. about 12mph extra speed adds half again to your (already poor rv) stopping distance.
Managing the energy and inertia of large vehicles is what bus and truck drivers learn.
RV pilots not so much:
High speed in the hammer lane...is the lock on the fridge door?Do I putter along at 50mph in the right lane on I15 in the open country in Utah! ? Nope. I'll run 65 and 70 on the retarder on the long down grades as long as I have lots of room in front. Do I drive fast in heavy traffic? nope.