Answering "can I safely drive this road" is always a tough question.
It depends on TWO things:
1. The equipment-- assuming it is properly maintained, likely not a problem.
2. AND MORE IMPORTANT-- the driver. Mountain driving in a heavy vehicle is very different than in a car. It does have a learning curve to it and the speed with which it is learned depends to a large extent on how well you "feel" the machinery. Knowing what gear and use of engine brake by looking at a grade is a LEARNED thing. Knowing when you have pulled a long steep grade and KNOW that you will need to gear down to avoid overheating is a LEARNED thing.
We have all gone through the learning curve (unless we only drive flat lands), but it is best to start out on the "bunny slope", not the black slope.