I have a Big Tex single axle trailer with a basket up front. I haul my Cheetah, a 21 Honda,1 trimmer and a blower, and a small toolbox with very little in it. I probably put 150 miles on all year as everything is pretty local. But both my tires are bald in Nov. when I finished up for the season (and they were brand new last spring). Granted, I did buy these from Wally World in April - because I was in a jam. The back tires of my machine are pretty much right in line with the tires on the trailer when loaded. The 21 sits up front to one side. Should I go to a tire shop and have them put radials on? Any recommendations would be appreciated. I forgot to look at the details of the tires/rims before typing so right now, I don't know their sizes. I think it's a 15" rim and probably a 75 tire.