Smoke Coming from Drive Axle Area

Today I got finished getting dry van live loaded at shipper...I thought I'd wait until the nearest truck stop to slide my tandems after using the CAT Scale. On the short 1-2 mile drive to the truck stop I had my trailer tandems all the way back and something near my drive axles started smoking, but I couldn't figure out what it was...it didn't smell like rubber from tires nor did it smell like wear from brakes. It was a very bright white smoke, and when I stopped in truck stop the smoke died down a lot and I couldn't see where it was originating from. I felt no heat from the tires or brakes.

I thought perhaps it was the exhaust because when I turned the truck off it subsided...but when I turned it back on it was sorta in the area, but still very hard to pinpoint...I also did just get off a 34hr break of just sitting, idling in the truck...

When I did scale the drives where at 37,000lbs. I adjusted them to 33,360lb.

 

Volvo...

 

Do you suppose it could have been the extra 3,000lbs that would do what you described?

 

It was near Lebanon, OR. It wasn't coming up from the road though...