The engine rpm limiter works on the fuel system - it isn't a physical restraint on the rotating machinery. If a heavy vehicle going down a steep grade is pushing the engine, the rpm limiter can't do anything to help, since it will already have gone to minimum fuel flow.
A lot of people used to the older V-8s, like the 460, get very concerned with the much higher rev range of the V-10. I've been around small high-performance motorcycles with engines that have peak torque at 8000 rpm and rev to 15,000. A 4-cylinder, 500cc engine doing 15000 rpm has a special sound!
If your tach is below red-line, you're fine.