How are Goodyear Mud Runners on hard pack.

Here in the Wisconsin Northwoods and Michigan's Upper Peninsula, many of our trails are made up of long stretches of abandoned r.r. grade, i.e. gravel, sand, mine rock. Most of our woods trails are sand or sand/mud. Unless we head for the lowland marshes or cedar swamps, we experience only infrequent and short stretches of mud. If not Mud Runners, any suggestions for this type of trail?