When we travel south on the 5, we always make a pit stop at the T/A Truck Stop in Buttonwillow. I stretch my legs by using their head and walking their isles. It amazes me how many CB's are still manufactured and sold at these truck stops.
Anyway, without paying much attention, I have noticed 12V coffee makers as well as other household items that are designed for 12V use. I don't know if the brand is "their" brand or an actual MFG, but I recall the brand as Pro-Road or Road-Pro?
I would guess that if the truckers didn't care for the brand, it wouldn't still be on the shelves.
I noticed the brand name, "Diesel" on a wall full of electronic gadgets for the truckers like CB antenna's, mic clips, external speakers, etc...
Again, I don't think they would still be selling the stuff if it wasn't up to truckers specifications.
Another alternative is to get one of those inverters that plugs into a lighter socket and then use a standard 110V coffee maker. As long as the wattage/power usage doesn't exceed the rating of the device, it should work.
I got my son one of those type of inverters for his Jeep and he seems happy with the few times that he used it while tent camping.
Good luck!