J-- I Spent 22+ years in the farm tire business, It has been done many times, especially if they are trying to get down 30" rows. The 18.4's fit on a 16" rim and 20.8x38's go on 18" rims. We had 1 man go to 20" rows on beans and decided he wanted to cultivate. We put 15.5x38's on those 18" rims, worked, but as soon as the correct width rims were available, that fall, we got him some and mounted the 15.5x38's on them.
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