I heard rumors about Canada checks, but never a full report that TC was put on the scales.
In US I was carrying 10,000lb on my F450 flatbed and as law require- I drove via scales. Never got pulled over.
Forklifts were easy to carry as I could put their counterweight behind the cabin so COG was well between the axles.
Than when I was carrying 6000lb tractor, it was sticking past the tailgate and the truck sag like hell. Had to pump airbags to max to level it.
That was the time when I observe that even long wheelbase flatbed is still design as grocery getter with axle in 1/2 of the bed.
That is why I think OP will have heck of the issue with his heavy trailer on long stinger.
It takes F550 to get rear axle moved to the rear for better load handling.
Additional observation- why Mercedes SUV in ML class make great tow vehicles even with their light weight?
... their rear overhang is about 2 ft
