Hi Bacho86,
Doesn't sound like the automatic is slipping as you were also loosing revs, I'd expect the revs to stay high or increase and speed to decrease for it to be slipping.
Not sure if you have VDC (traction control) on your model but that was my problem. First time I took it up a gnarly track the system tried to take over and I lost power, not at all impressed.
Now I turn in off when I go into 4WD and never had the issue again and I've done some very steep climbs both with and without a camper on the back.
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