You're right about me having used it on the road, but only one of those times was other than to mow the front drainage ditch. In October I ended up selling the boom mower to cover the $4K I needed for paying property taxes. If I make 3 trips a year on the road now, I will be suprised.
As for the intended use for the duels, I have a couple of areas which are pretty soft in the winter that I drive through with hay for the cows. For some reason, this winter, the ground seems to be wetter than it's been in the past. Probably from driving through there last winter combined with the wet summer we had. Since the duels came with the tractor, I figured I'd give them a try and see if they help any. If money allows, next summer I'll dig out and rock those areas. In the mean time, it's try to take advantage of what I have.
Then, of course, there's always the cool factor that Roy mentioned. I'm the type of person that has to actually put them on just to see how they look and work. If it doesn't give me any advantage, they'll come back off. Either way, I'll have the ability to use them if needed and I'll know the pros and cons of working with them on the tractor. I don't think I would have ever spent the money to buy them, but since they came with the tractor and I already have them.....