Yes on the OshKosh and Autocar FWDs the rear singles are narrower than super singles. You're right you don't want to run a big floater, But also the are not as narrow as typical Duals are either.... Usually too much load for one narrow tire!!
Two photos I took in Western NY today. A Town of Clarence truck on Ransom and NY 5 at 9:30. An NYSDOT Mack at a rest stop on NY17 near Bath around 11:30am.
Hi IC- Smoke. I was just through your neck of the woods yesterday. I noticed that the OTP has Peterbilts. Some nice looking trucks, I was wishing I had my camera so I could have posted some pics on here.