I've got 13" tandems and I could actually tell a difference in how well the trailer ROLLED when I went from biased-ply to radials...been w/ Goodyear Marathons ever since 5-6 years and wouldn't do anything else...as w/all tires, keep the air pressure where it's supposed to be
Been on many LONG road trips SC to FL(11 hrs) and to coast(5 hrs) and so many trips to lake 1.5 hrs each...just don't have any problems...
