I did mean width, but I as said in a later post the 2-4 foot difference in width is not going to make any appreciable difference on a trail with a 16 foot plus tounge length. On a much shorter (5-6 feet) utility trailer, yes the width will have a profound difference.

An easy was to exaggerate the effect of axel width and tounge length is to back the trailer up. The easier it is (removing practice and skill at backing trailers up from the variables) the more stable it will be behind your tow vehicle.