crusty

If you look at the original poster's profile, they have not been active in nearly a year and a half. Don't expect a response. This thread is 5 years old. Models have probably been added and removed in that time. Even if it was the same model number it might be very different now.

If they are asking 14k-16k axle ratings, something is seriously wrong. The front axle rating is WAY less than that. Someone is looking in the wrong place if they think those are the choices. Open the driver's door and look at the label. It will list the front axle weight rating, the rear axle, and combined. The only thing not listed is the Gross Combined Weight Rating, that is the weight of the van and trailer combined. That info is in the owner's manual. You will have to check if you have the V8. Can't answer that for you. The 2500 could have that or the V6. Tow package, walk around back and look if there is a 2" square hole below the rear bumper. If you have that, that is where the hitch slides in and you have the tow package. Generally the V8 always has it and the V6 is optional. No hitch, no tow package. The hitch and the wiring that goes with it are all there is to the tow package.

Take it back to the dealer. Mention that if they don't fix it, they can buy you a new set of tires. It's in warranty. If that fails, contact Nissan customer service and complain about the dealer. Nissan hates dealers that treat customers poorly. And you will get corporate breathing down the dealers back. Remember the dealer is an independent franchise. All they do is resell Nissan product. They are no way owned by Nissan. If the dealer sucks too much, they risk loosing the franchise. About the only dealership that is owned by the manufacturer in the united states is Tesla. And in many states they cannot sell because they are not going through a dealer. And more states they are running as an exemption to dealership laws. In other countries auto dealers are run by the manufacturers.

Lots of highway time in both. Find the Nissan way more comfortable. Better than some new pickups. Weight + high roof, the V8 could actually net you better mileage over the V6. The V6 was marginally better for economy over the old V8, the new V8 and transmission has a noticeable improvement.

7500 pound trailer? Regular towing? Get the V8 Unless you have actually run that trailer across a set of scales when fully loaded I bet it weighs more than that. Most people horribly underestimate the weight of what they put in a trailer.

Leave the 5th tire away from the van as you program. It will be forced to only see 4 sensors. The system can only accept 4 sensors so once they are programmed the 5th will have to be ignored. I don't know if the system will learn a new sensor during the rotation programming? But programming tools are getting a lot more affordable these days, that WILL work.

The newer engine isn't as new as you may think. It and the 7-speed were in the market starting with the 2011 QX56. So those have nearly 10 years to get them right. The '11 had a few bugs, but generally good after that. Having driven both, the new V8 and 7-speed is the one to get. It's what I am hoping to add to my personal collection. Like the ones at work too much.

The contact pins often don't make contact. If you can lean on the door and mash it into the contacts a little harder and it does work that is the issue. If you take the contact plate out and shim it from behind with a few washers that will often fix it.