You should feel good about your choice!!!
I'm on my 2nd Dodge Deisel 96' and 00'.and our farm had a 93'. I've yet to have a problem with all three trucks. (They 93 was a tad uncomfortable after 5 hours of driving though)
We have ours for my wife, she pulls about 10,000 pounds worth of horses/trailer/hay/tack about 10-12 times during the summer show season across the state. I doubt you'll ever hear her complain with 4500'.
I only wish they had the full size crew cabs like the ford and chevy. Next year!