@TabberJohn does the Dutchman use a torsion axle or is it a spring axle? That might be a difference? FWIW I have a Wells Cargo trailer with a similar Dexter axle as the Tabs and exactly same with no shock. I am most convinced a shock would justify the effort on either application?
What do the rest of us have that is different from a Dutchman's frame and axle? I get your point I but haven't noticed any tracking issues with our setup. Is the issue more pronounced with a lighter trailer?