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2004 gmc
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I do that sort of stuff all the time with my 3500 lb max trailer. But I have an aux cooler AND a scangauge to watch the tranny temp in real time, all the time. If you don't have a Scangauge II, I strongly recommend it.

Sometimes, especially above 6000 feet, I'll be in 1st gear, 2/3-3/4 throttle for 5-10 miles at a time, 85-95 ambient temp. If the coolant temp goes over 235 I might turn off the AC and use the heater for some aux cooling, but almost never need to.

If the hill gets worse than that, just drop it into 4LO and get another 2.7-to-1 reduction. :thumbsup:

Descending is just a matter of getting into 1st gear, staying off the brakes as much as possible, and monitoring the tranny temp, since that's where the heat is going. I just started carrying one of those non-contact infrared thermometers to monitor the trailer hub/bearing, and brake drum temps. Keep them under 200 and you'll do fine as well.

Is that trailer a tandem with four brakes, or just two?
 
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