trailer weight
You can put unlimited weight on the trailer without sinking the truck to the overloads - it is a matter of where the weight is in relation to the axle centerline. I know that single wheel axles with 9000 lb. ratings are common, times 3 axles gives you 27000 gross trailer weight. A trailer with 3 axles might weigh in the 7000 lb. range (depending on length, etc. , etc. ), so you could put 10 ton plus on the trailer and with minimal weight on your truck, and you wouldn't see any tire squat on the truck. As mentioned above - it isn't whether you can pull it, but can you stop it! I'm running more horse than when I started driving semi as a kid, and grossed 73,280.
I'm also hearing rumors that some states are starting to look at vehicle GVCW ratings, and not looking kindly at people who are exceeding those. It sounds like Canada is especially sensitive about overload issues. If weight is an issue, I would certainly look at the dually! I'm beginning to wonder if I should have . . .
Ray