All good advice Jon. I've driven many a loaded truck with no Jake in the mountains and was taught to go down the hill in the same gear it took to climb it, and to brake firmly to bleed off speed rather than ride the brakes. Basically if you use a lower gear to hold your speed down and brake only to keep from over revving the engine you should be fine. The other thing this does is let the block cool gradually from the heat of climbing the hill which is much better for the engine. Another thing worth mentioning along these lines is to never switch off as soon as you stop. A engine running a pyrometer temp. of 900 degrees or better needs 3-5 minutes of idling to cool the block evenly. Otherwise it will just get hotter after you turn it off!