Here’s a chart that shows what happens to ... but they don’t solve the problem of front-axle weight loss. Keep in mind that trailer loading is also extremely important.

Those wheels were not designed to carry any additional weight, but they made the trailer longer, and under the load and axle spacing tables they increased the potential payload by a couple of thousand ...

Have you ever overloaded your vehicle so that the rear axle was touching the bump stops? How do you know how much weight you can put into your vehicle or how heavy a trailer you can pull?