Help me choose between these three? Please

Okay. I am looking to buy a used ram diesel and I have found three trucks that I think are good deals, but I need help choosing, because I know very little about the pros and cons of each year model. I plan to use this truck to pull my 24 foot tongue pull travel trailer on a 5000 mile trip to Canada this summer. Please help.

TRUCK 1

2003 Dodge Ram 2500 Truck 2WD Quad Cab SLT $10,865

Mileage: 179,925
Body Style: Truck
Exterior Color: 1 owner with Clear carfax and records
Interior Color: Gray
Engine: 6 Cylinder Turbo
Fuel Type: Diesel
Transmission: Automatic
Drive Type: 2 wheel drive - rear
Doors: Four Door


TRUCK 2

2007 Dodge Ram 2500 Truck $13,000

Mileage: 167,000
Body Style: Truck
Exterior Color: White
Interior Color: Gray
Engine: 6 Cylinder
Fuel Type: Diesel
Transmission: Manual
Drive Type: 2 wheel drive - rear
Doors: Four Door


TRUCK 3

2005 Dodge Ram 2500 Truck 2WD Quad Cab SLT $15,250

Mileage: 133,424
Body Style: Truck
Exterior Color: Bright White
Interior Color: Taupe
Engine: 6 Cylinder Turbo
Fuel Type: Diesel
Transmission: Automatic
Drive Type: 2 wheel drive - rear
Doors: Four Door

The 03 and 05 have the 5.9, whereas the 07 might have the 6.7, which has the emissions crap on it. I've heard 05s are a great year for the Ram diesel.

Are you able to see them all in person?

No I cannot see them. They are all two to three hundred miles from me. I have heard the same about the 05s, but I have also read that the 03s and 04s are better because of the injectors going bad on the 05 due to ultra low sulfur diesel.

This might seem like an odd question, but is there in difference in the size of the rear cab between the three?

Also, when people say "Emissions crap on the 07" what exactly are they talking about? I have only owned one diesel before and it was total junk. It was a 93 Ford F350. It got like 9 MPG and the trans went out within a couple months of me buying it (in 2009). I gave that piece of crap to a guy who thought Ford hung the moon because I was not going to a dime fixing it.

Early gen emissions screwed fuel mileage and could cause problems I heard. I believe all the rear cab sizes are the same

Quad cabs for those years should all be the same. The bodies are slightly different but the basic cab is the same for those years and doors/fenders and stuff can be swapped between them.

Traveling with anyone? Kids? Quad cab may be tight for such a long trip for more than 2 people. Crew cab would be much more comfortable.

I'd go with the 03 or 05