Not really familiar with the 1500 series Ram but as you stated, you are well with in weight capabilities of the truck. Depending upon which transmission you have, 6 or 8 speed, that will make a significant difference I think. As for elevation effects on the engine, I'm certain there will be some but shouldn't give you any problems. Just a couple of pre trip tips, make sure that your brakes are adjusted properly on the trailer, insure that all tires are inflated properly (cold), and last but not least, approach downhill grades with caution and lower speeds. They can be deceiving. Much easier to accelerate if you desire but slowing and or stopping will be much more difficult. Also watch out for wildlife as it is difficult to see them along the narrow roads with the grasses and such that they hide and graze in. I hope you have a safe and enjoyable trip.