Advice on a 2004 dodge Ram 1500 truck towing capacity

The truck chassis/suspension will be fine.

The little motor likely won't like the weight, especially in our western mountains.

You can re-gear the axle with an appropriate towing ratio (4.10, 4.56, 4.88), instead of the highway gears it likely has (3.23, 3.42, 3.55). The gear change will pick up alot of usable torque to pull in the mountains.

I changed one of my F350's from 3.55 to 4.56 and it was a WORLD of difference.