Thanks, Dave. On a side note: here is one that has a good section on weighing a trailer:
http://www.goodyearrvtires.com/pdfs/tire-care-guide.pdf
------------------------------------------------------------------------------------------------
And here is an article that has a good section on radial vs bias:
http://www.boatus.com/trailerclub/trailer_tires.asp
BoatU.S. Trailering spoke with experts at two trailer tire manufacturers: Goodyear (maker of Marathon radials) and Kenda (maker of Karrier ST Radials and Load Star bias ply tires).
Bias Ply or Radial?
There are two kinds of tires: bias ply, made with layers of nylon textile cords placed on top of each other at 30-degree angles, and radials, composed of a single layer of rubber-coated steel cables with more steel belts placed at the crown of the tire (the part that touches the road). Bias ply are less expensive than radials but are more vulnerable to developing "flat areas" after sitting in one place for a long period of time. Radials are preferred by many for use on long highway trips as they run cooler than bias ply.
Radial tires offer many advantages for trailer applications including less heat buildup, better ability to carry loads, less rolling resistance (better fuel mileage), longer wear and softer ride. Bias tires offer stiffer sidewalls, which may be beneficial in some applications, but usually not in "trailer" (free rolling) service. -
Goodyear Tire Company
Radial tires cost more and some tire makers push for it because they don't have bias ply to offer, but the fact remains that bias ply tires have stiffer sidewalls that will be more stable on the highway and give better comfort performance on off-road condition. Bottom line: Either radial or bias ply tires are fine as long as they are designed for trailer applications.-
Kenda Tire Company.