Did you ever leave a store without buying a gas can ?Used my home made fork extensions to pull my 60 gallon diesel storage tank/cart out of my shed.. with about 30 gallons of diesel in it, probably in the 340 pound range at the end of the 6 foot forks.. did not feel tippy when I first had all the weight on it so I proceeded with the load.. the diesel cart was on top of the 2 other carts that I removed separately as they weight in the 400 pound area and I felt it would be to much weight that far out.. that and less chance of the diesel cart possibly rolling off even though it was strapped to the other two carts..
The last picture is the end result.. and to get more storage space in my little shed for gasoline and push mower storage
You can see the pallet full of gasoline cans and a few diesel cans..