I bought my 2004.5 RAM dually Laramie 2WD five years ago in very nice condition and 62k miles. I use it as a tow rig mostly and it has 94k miles on it currently. It has been extremely reliable for me and a pleasure to drive and tow with.
That being said, it has about the same capacities as a current 1 ton SRW truck. I wouldn't consider it for the trailer mentioned. Gross combined rating on it is 21,000 pounds. I tow at 18,000 pounds combined and wouldn't want to push the truck much more. I know people tow more with 3rd Gen Rams but this is just my opinion.