Dually?
Streamer1,
I am not quite sure why you would want all that heavy springing for a 25' trailer, or for a 34'r for that matter.
One of the big cons against having too much heavy rear springing is the fact that it will beat your trailer to death, literally. Your hitch and thus the front of the trailer will have a very rough ride because there will be practically no give in the rear suspension. Therefore, when going over rough roads or poorly designed bridge transitions, you will be SLAMMING the front of the trailer up and down, instead of a more cushioned ride. This will have a severe effect on the frame and the internals of the trailer. Just as too little spring can be dangerous, too much can be destructive. Somewhere in this forum is a discussion on this very subject.
Seriously consider a 3/4 ton diesel picking up truck or comparable SUV. You will be much happier with the ride especially sans trailer.
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