If the Toyo M55 were available in my size (315-75 R16) I would have given them a try on my F250 Super Duty. I ended up last week putting Cooper AT3 XLT's on it and they ride and handle great. I was looking for a tire that rode well on the highway but work fairly well in snow and on gravel. Since I lost my hunting lease last year my off-roading is limited.
Since you like Coopers the AT3 XLT's may do what you want if muddy pastures are not an everyday thing.
