Now I'm not a 100% certain of the conditions her in this case, nor am I 100% certain of the conditions in this next case I'm about to mention, but I think the problem lies on the backs of the automotive/ trailer manufactures.
My brother lives in Alberta, Canada and he regularly drives to B.C. with his new F150 and new camper in the back of the box. Well he "was" regularly going to B.C. until he found out the hard way he was overloaded! Yup he got fined and he had to drop the trailer off at the back of a weigh station and have it shipped back home.
So Craig's found out, the trailer's weight is heavier then the manufacture says it is...apparently with the F150 just about out of gas, not a single thing in the truck or in the trailer and with no passengers or driver in the truck the unit is about 120 lbs overweight!
Now how's that right?
So Craig tells me, the dealership says the truck will have zero issues with the weight of the camper unit and the camper's dealership says their unit is 100% legal on the back of a new F150. Craig has now sold the camper unit and is riding out the lease on the truck....he'll buy a camper van next.