It's a start...

[hatidua]

The five gallons mentioned here have a habit of cracking, even though not frozen.

That's the first I've ever heard of Scepter cans cracking. If you can drive a vehicle over them, I can't see how just sitting full of water would cause any issues....?

I just did some web surfing trying to find any mention of Scepter cans cracking and if you had one crack, I'd love to hear the how/where/why as nobody else seems to have encountered the problem.