I plan on getting a new(one trip) 40' standard or high cube grey or beige sae container. Now I am wondering how level do these things have to be for the doors to work correctly because where I will be putting it at first isn't completely level? Also would solid concrete blocks be strond enough without breaking to put on the corners on the container? I figuered if I can get it on the blocks that will give me a few inches to get a jack under it to maybe level it up some. Another question it will be sitting near hard packed gravel from our semi's packing it down the past 30 years. Will it hurt the container on its bare bottom if we use a 850d case dozer or 380c skidder or even a 90hp kubota tractor to pull the container around on the hard packed gravel if later on we want to move it around on the lot? Do you guys think this new container will be good and secure to keep my atv's and other valubles in that I am araid id going to get stolen? THANKS!!!