I tow my car hauler 80+ mph on these same tires with nary a problem. Currently, they've got about 80% treadlife left and have a little over 20K miles on them. The things that you need to concern yourself about with these tires on a truck is ride quality (low), durability (high), road travel (excessive for any truck with a straight front axle), and type of use (no way for the highway, but fine for around town, <55mph or farm use).

Weigh your options, but if you're going to do any real road use at all, spend the $$$ on the 10-ply radials.

Pessimist - Sees glass as half-empty. Optimist - Sees glass as half-full. Gov't- Sees glass and takes it from you because you have a glass.
Political Correctness: A philosophical belief system bereft of common sense and logic, that supports and rewards ignorance and stupidity.