They do increase the surface area contact and can add weight to the rear end, which is much needed for some front end implements. I have them on my original and need them for my Mars sweepster broom on the front. They are also good for a wider stance if you are on inclines. I am running the 6's on the back and in order to make my duals more narrow (so they do not stick out much past the front tires since I want to be in the path of my broom), I reversed the inside pair for the offset and put the outer pair on facing out. This also allowed me to use smaller carriage bolts on them, which are a bit easier to maneuver.
IMO, anyone with a FEL especially if they are running the 6's on the back, could benefit from the stability and added weight of duals on the back. So, aside from the "cool factor", they do indeed serve a purpose for certain applications.
Cub Cadet 123
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