Sounds like you are from SD to.  Same problems, but with a green head. Snow, mud, rocks all are a problem.  I have been there before, 78, 82, 85, the ice storm of 96. Run low , run slow and work into the lean if possible.  Other than that good luck , at least most off yours is still on. PS. Iwoundered about end sheilds also , but they may catch and push. Good luck and Keep the Snow away.