Assuming correct alignment, I would look at your ride height. In my experience with 8-bag trucks that has been the source of most vibrations. 1/2"...
Manac and BWS/Ez-to-Load are both tough tailers. Built for our market and we torture stuff up here. Our 53' BWS tridem regularly hauls 69,700lbs...
The load rating assumes spreading the load over both welds on the pocket. You drop a chain through the pocket and hook to it you're only tying off...
Mine was coding low voltage to vva on #1 and #2. Replaced the harness and All my vibrations, driveability and atrocious fuel mileage problems...
I think all 4 Western Provinces frown on the bigger spreads. You're good to 37,400lbs on a 54" tandem and 39,600lbs on 72". Given those weights...
Nova Scotia and Manitoba are 2 Provinces I know for sure don't allow a 10'1". Period. Nova Scotia may "see" a 9' and send you on your way....
