Looking at adding a set of the Duraflex scratchers to our Summits, looking for opinions on these things before I pull the trigger. I need these as I have a trip coming up that's going to require us to ride over 70 miles 1 way down an unmaintained road (Denali Highway) and I don't want any over heat issues. Road gets lots of traffic (sleds, dog teams, track rigs) so I'm planning for a hard packed trail.