Great video except I didn't catch where he speaks to legalities of the weights.
Payload is not an enforceable #, but GVWR along with GCWR most certainly are. Same with both GAWR's. You get into an accident or even get pulled over and they have you step on the scale, look out!
It just isn't worth is fellas. I have no problem with ppl writing their own death warrants but don't include your family or other folks on the road. You are essentially driving a 15,000lb+ missle with your typical 1/2 ton and lightweight RV....