Good Evening,
I am going to make some recommendations that I hope others can add to. It is hard to tell the exact condition of the remaining supports based on the pictures. This strategy was used on an old barn recently and worked. Hopefully it will work for you.
If your tractors have a loader on them you will not need a skid steer. Two tractors with loaders will make it even easier. It is assumed you have at least one loader since you have round bales. Start at the opening with 4x4's that span the width between rafters. Use 4x4's or basement floor jacks. Lift the second span higher than the first span with the tractor and set upright supports under 4x4's running between first set of rafters. As long as the tractor is under the previous support point you should not need to worry about a cave in. Continue to move back into the building as you brace each rafter. I am assuming you will need to support each side to have a runway through the middle. If all of your stuff is on one side of the building, you can get by with one support per rafter.
Another option is to put the 4x4 support beam on the bucket before entering the building. Use the bucket to lift the 4x4 between the rafters and set the upright supports.
To be really economical, remove the front of the shed and use the metal to create your substructure. You will either have to weld it or drill holes and bolt them together. I would use a cutting torch with propane and oxygen. You can cut the side walls and roof instead of pulling nails. The metal on the rafters will not affect the substructure.
Hopefully this helps. Please keep us posted, pictures would be a bonus. If this does not make sense, please pm me and I will give you a phone number for more information. Good luck and hopefully others will add other ideas.
P.S. I am not an expert and am only offering ideas. When working on the water tanks, the experts would not offer information for fear of liability. This is only an idea, not a solution. Good luck.
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