On September 23, 2017 at 21:12, IRkiller said...
Chainsaw little slices off each post until it's on the ground. Nothing can go wrong with this -- guaranteed ;)
And to help nothing go wrong with it, this:
Select a corner that you're going to cut shorter. I recomment a 1" cut unless creaking sounds tell you that you have to go in shorter increments.
Jack up that corner by 1/4". Cut an inch off the 4x4 post. Lower the corner onto the now shorter 4x4.
Go around from there, doing the same thing over and over.
The last cuts require supporting the corners from outside instead of underneath. Attach to each corner something that will support the corner, and place it high enough that the jack can lower it all the way to the ground.
Be precise and make FIRM connections. If anything starts to slip, it's a goner.