I have pulled similar trailers with 12″ and 8″ rims forever. Usually a bit heavier loaded in fact. Single place snowmobile trailers with 12″ and 8″ and also boat trailers with 12″and 8″ . All held up fine (to include several cross country trips). Obviously your axle bearings are spinning faster than a larger diameter, but I never had an issue, either with bearing problems or excessive tire wear.