Weight distribution chains stretched too tight?

GateMaster97 wrote:
...Does anyone replace their chains after a certain number of years or uses due to chains are capable of stretching, becoming worn, fatigued, etc.?

I'm currently using the hitch, bars, and chains that my dad used back in the 70's to haul us around camping. They still look and work like new and I'd be willing to bet one of my kids will be using them 40 years from now.