Noone said it can't be done. Its the fact that it is not legal, particularly safe, and if anything ever happend, and you were in the ballpark of 500-1000 pounds over the GVW, insurance, the cop/DOT is going to take a large dump on your head in most cases. Ive overloaded a half ton truck doing firewook, and other various things, but wouldnt do it with a couple 10...20 grand sleds, for any extended distances thats for sure.
I would agree, "just cause you can, doesn't mean you should".