On an extreme, I'd consider having the brake shoes replaced. It is $100 or so plus labor, but the most important thing isn't going to be how you climb the hill, it is how you are going to be stopping.
Another item that might come to mind is the transmission cooler. Using
this post as a reference, I'd consider replacing the transmission cooler with an
aftermarket cooler which has a lot more area. Transmissions function up to a certain temperature... then when they start hitting an inflection point (180-200 degrees), they cook quickly. This is especially important if towing.
Of course, with a newer model of class "C" with an OBD II port, having a Scangauge is good for temperature monitoring.