Dictator's comment in jest does cause me to ask as serious question it brings to mind. I doubt there is any difinitive evidence either way but just wondering what fanatics think............. My greatest concern in owning a SSR is those roof cylinders, so have read most of what is posted regarding members problems with them. I am wondering if weather extremes effect the longevity of them. In summer the top compartment obviously gets way over 100 degrees if your vehicle happens to be sitting out in the sun. In winter the temp. in the compartment can be below zero. For example here the temp. here is to be 6 degrees tonight and wind chill at -20. My truck is inside an unheated shop but some in Mo. are sitting outside I would bet. I am wondering if these extremes effect the life of the cylinders. I have tractors that are used in the cold and heat all year long and the hydraulics are not effected on them that I can tell. What is your opinion?