Not saying it can't happen but I've never seen a vehicle end up on it's roof because of chains that are too strong. I have seen a recent news article about a trailer that came off the hitch, broke the undersized chains, crossed the center line and impaled a dad and his child. I've got 2 5000 lb chains for my 2000lb set up. They cost me about $15 from Home Depot. For better or worse I'm hoping that wherever I go my trailer follows. I can probably find a link to the news story if anybody wants to read it.