That's baloney on truck tires. My 1100/22s are rated at 87 MPH with a full load. We run 75 MPH in western states and 80 in Texas. China Bombs, which I'd never run are dangerous sitting still. Blew one out at Bluewater Keys Fl on a 70 degree day sitting still. Started running Michelin LTs on it from then on. Why is the differential speed (not limit) on I 81 a problem? Because all the trucks run the L lane and 1 pulls out at 1 mi per hr faster and then they all slow down on a hill. I say make all trucks meet the speed limit or run the 2 lanes. It makes people mad when a truck swerves out to pass like that.