my experiance
With my C15a and the 10.50 16 chevron tires i had a little bit of shimmy between 30-35 MPH, faster than that it went away. I did as i previously noted reduced running pressure from 50 to 38 and the ride improved but the shimmy was only slightly improved. As a side note i used a lazer temperature gauge to monitor tire pressure and temperature so now when i drive fully loaded I put the rear tires to 43 and then they keep the same temperature. early this year i rotated the wheels and tires front to back and the onset of the wobble started much earlier about 28MPH and was worse and lasted until about 42MPH.
I took it into a truck shop and had the wheels balanced on the heavy truck machine, not the automotive one. Added as much as 9 ounces to one of the now front wheels. the rear ones which had been on the front only needed an ounce or two. Took it out on the freeway for test drive and it was better than ever. Never picked up a shimmy at all.
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