From http://www.mreinfo.com/mre-longevity.html

“Avoid fluctuating temperatures in and out of freezing level.”

I store 2 weeks worth of canned food in a travel trailer parked away from my house. I know that I go through the same freeze-thaw-freeze-thaw cycle that you do. I rotate the canned food once a year and have yet to find any that didn't taste good, let alone any that were spoiled. But MRE's are too expensive to rotate like that, at least for me. I just bought two cases of regular MRE's and have been keeping them in my basement at about 55 degrees F. I think I'll keep them there and stick to canned for my vehicle kits.

Regards, Vince