My reading leads me to believe that no diesel refinery in the US produces anything but ULSD diesel fuel.
Don't know what you are reading but all major USA refineries are producing enormous quantities of "Non ULSD" fuel. Marine diesel, agricultural diesel, commercial power plant diesel fuel is not ULSD. The USA sells a lot of diesel - much of it to the northern neighbor. Off highway diesel is dyed.
But there is no great surplus of ULSD. This is why Mexico has to occasionally purchase Japanese ULSD through it's Rosarito offshore pumping facility.
I believe the simple warning of "Using Other Than ULSD in This Vehicle Will Void Warranty" serves the purpose.
The U.S.A. may export diesel to Canada (the northern neighbor) but it will be ULSD. We adopted the standard before the Americans did. As for agricultural, those big new tractors on the farms use only ULSD and require DEF.
Don't put our dog in your fight.
In homer today. We plan 4 or 5 nights. Right now the wind is howling. We plan on fishing Monday assuming the weather forcast is correct and the winds settle down. The road down was fine but windy down the turnagain arm.
Aren't you glad that you have Comfort Drive?
Since you are asking the question, I guess that you aren't staying at Bentsen Palm Village or Retama in Mission. There is plenty of both of those activities there. The Bentsen Rio Grande Valley State Park no longer allows vehicles or camping in the park so the interior roads and the former campground circle make good paved bicycling. You can take kayaks into the Resaca in the park but you have to carry them in (NO FUN).