You'll save a little on the turnpike. Make sure your gonna stay under 20,000 on that rear, I know Ohio has scales as you enter toll booths. I don't think they will mess with ya if your a private coach and not to far over.
It will definitely ride nice, the closer your to the max the better she'll ride. I ran a few trips that I am sure I was close to max on the front and real close to 20,000 on the rear and that rig rode like a Cadillac.
I know alot of guys like the tandems for traction, on the road I never had a problem off the road forget about it, she would go done like a sinking ship.
2012 Showhauler 28'6" Motorhome on a Columbia w/ 450 Mercedes.