Be aware of the heat factor
Remember that the exhaust brake builds heat in the turbo, manifold, and cylinder head. That's why it's great for warming up a cold engine. However, you shouldn't use it if you're about to shut off the engine, because you don't want to shut down when the turbo is hot. Oil will bake onto the turbo bearings and turn into "coke", a very hard form of carbon.
My EGT probe is mounted on the exhaust elbow, just downstream from the turbo. I like it there, because it tells me how hot the turbo is. I let it get to 200 degrees before I shut off the engine. Most of the time, it takes a minute or two, but if I've been climbing a mountain grade, it will take 5 minutes or more.
I've gotten into the habit of not using the exhaust brake if I know I'm going to be shutting off the engine in the next minute or two, such as pulling into a parking lot, etc.
Otherwise, I use it anytime I need to slow down, towing or not. Andy