We installed Trimpe bars in the early 80s. At that time are goal was to handle giant rag better. We were told that the bars would increase our capacity, but never dreamed that they would do what they have done. We originaly ran an 18' series 2 head,equiped with White Qwick Cut, full out in 2nd gear. I spent more time repairing that head than I care to remember. In 94 the local Case IH dealer started pushing the Tracker option on wider heads, after applying a tape measure to the machines I decided to give it a go. We now run 30' full out in 1st gear. I now spend very little time on the head. The Tracker option makes the wide head work like a dream in all kind of conditions, considering the narrow tire spacing. At 3mph the head has all the time it needs to work over rocks,ground hog ($nn$%and**%nnn)holes. The head does a good job complementing what I believe to be one of AllIS CHAlMERS_GlEANER'S finest machines.