Dean,
I have never done this, but I have a friend that used to own a trailer sales/service so I asked him how they did it since I know they had changed springs and lifted 5er's suspension.
Here is what he advised that they did. First off you must have access or own some very powerful floor jacks, minimun of 2 but 4 perferred. He says you must raise all the 5er until weight has been removed from the suspension, they do this by placing the floor jacks under the frame. They keep the truck hooked to the 5er for safety to keep it from moving front to back. They lift the whole 5er at one time so there is no pressure on the suspension whatsoever since with the middle pivot any pressure on the front or back it will be on the pivot.
After making sure that the trailer is secure, they remove the bolt for each point one at a time and move that point down and reinstall the bolt. He says you probably will have to use a pry bar to move it down and hold in place to reinstall the bolt. Do this with all six points and you are done and just lower the trailer.
He says the hardest part is lifting the trailer, but of course they had impacts and four 12 ton floor jacks ( I believe that is the size).
That is what one pro used to do. Sounds easy doesn't it? Like I said, the hardest part is getting the trailer lifted and supported to get the sprung weight off the suspension. It takes some very powerful jacks, that is why I believe most people take them to a service center that has the equipment to handle this.
Good Luck,
Ron
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