Just a heads up for other owners who run into this. Took the van into the shop for a check engine light, turned out to be a clogged catalytic converter, was quoted around $1500 to have the converter and pre-converter swapped.
Had a friend show me:
which basically says that the clear air act has a mandate requiring manufacturers to cover warranty of "Specified major emission control components" including catalytic converters up to 8 years or 80000 miles, whichever comes first. A key wording on this mandate is that it only applies to "light-duty" vehicles which is classified by the EPA as anything having a gross vehicle weight rating of 8500 lbs or less. Even the V6 NV 1500 has a gvwr of 8550 lbs so pretty much any of the HD lineup is not covered even though certain Titan models are. Fun times.