This one should go without saying. Having a full-size spare tire is a life saver. You can get away with donuts on cars because they’re so small, but on a truck, it just makes sense to carry a proper spare. This is important for trucks in particular just because they see more hazardous road conditions than cars do in the course of their lifetime.
You definitely don’t wont be to be caught out on the trail with a blown tire and no spare because you were “trying to save weight.” Not fun.