I can relate to the condensation issue. Me, Milliman and his BIL got a sweet deal on 3 20 footers about 12 years ago. I used mine to house my big air compressor and zero turn. When the ceiling started dripping I asked Dr. Google for advice ( and got plenty). Some said to insulate and condition the air. Others simply said to match the inside air with the outside air via an fan circulation air through the container. I do have a wind powered twrily doohici exhaust fan on top but it isn't in the wind enough to do much good. I have a small electric fan that needs to be installed. Its on the to do list....which is long....maybe this year....
Joe, my work has purchased at least 8 containers (20s and 40s) from this company over the years for decent prices/delivered.
https://kkcontainer.com/I have no idea what the going rate is now given what is going on in the world.