I have a single axle trailer, boat weighs about 2,000 lbs. Right now I have 2 bias ply f7814's by BF Goodrich that need replacement. Should I switch over to radials & what are the differences between radials & bias ply as far as trailering? I haven't had any problems with the tires I have now, but there over 10 yrs. old & i don't trust them any longer. Can anyone recommend a good tire?