I have had my "day tank" inside of a tensioned fabric storage shelter on my best bud's farm for last 20 or so years, but he has been offered to swap that farm for the land surrounding his home acerage and we need to get things into "saleable" presentation. I have a large horizontal tank on one side and a "small" (6,500 USG) vertical on the other side that we use for farm fuel. First problem was that we put this stuff inside when we were 20 years younger and had a 10,000 lb. telehandler on hand. Had to lay the vertical down, so firsts had to skid it into the center of the floor. It had sunk about 3/16" into the asphalt over the years, so a lot of jacking and shimming before using 9k winch on my chore truck to skid it in place. To lay it down, I build a bracket to bolt onto the top, central lid using exising holes. When I went up to measure, I found that it still had the original fasteners from probably 70 years ago - and even at that done with pre-war hardware. It used square bolt heads and square nuts. When I called for a 3/4 AND a 13/16, but buddy thought I was nuts (yeah, that' a fastener pun). Had to explain to him that going way back into the last century, people couldn't afford duplicate tools so fasteners used one size for the bolt and next size up for the nut. Have seen it once in a while with hex but almost always with square...but have to admit it has been quite a while since I last removed square headed fasteners at all. Helps explain why there are still some 8 point socket sets around in the vintage tool world (and I don't have them up to that size).
Just in case anyone was wondering: used truck winch to pull the tank over, catching it with a 2 ton chain block on a trolley on monorail track in middle of building. The electric winch was too light to do this safely, thus the heavier chain fall. Once we got it leaning against the back of trailer used 6k forklift to pick up the base and skid it fully onto the deck. Offloading on other end was with my mobile crane, spreader and basketing slings. Not sure how/when/where I will put it back in service as my yard is still very much under development.
Just in case anyone was wondering: used truck winch to pull the tank over, catching it with a 2 ton chain block on a trolley on monorail track in middle of building. The electric winch was too light to do this safely, thus the heavier chain fall. Once we got it leaning against the back of trailer used 6k forklift to pick up the base and skid it fully onto the deck. Offloading on other end was with my mobile crane, spreader and basketing slings. Not sure how/when/where I will put it back in service as my yard is still very much under development.