According to the Trucker's Forum, I occasionally review, the results are in on Super singles.....50/50.
People seem to love or hate them. Some say they ride better on dry, smooth highways. Most say they get real loose on wet pavement.
The reduced weight seems to be the biggest advantage (lowering your GVW allows more payload before you reach that magic 80,000 GVWR).
Fuel mileage is negligible. MAY, MIGHT, COULD be saving less than 1 mpg...or might be saving a bit over 1 mpg. One MPG over 100,000 miles run in a year....could add up...especially for a fleet.
When compared to the additional cost of singles over duals, the numbers get kind of fuzzy when considering a break even point.
BLOWOUTS seem to be manageable as far as getting safely stopped. Of course, you then are STOPPED until a replacement comes...no limping to the tire store.
For what it is worth....most fleets I see on the highway are still using duals. Trust me, if they thought they could save a penny, they would.
Putting them on a class A rv?????? I can't see the advantage. I can sure see where it may become a dis-advantage. The limited return, when compared to the added cost/risk...doesn't make sense to me.
BUT....they do look COOL :B