DK, I got a new 18' and really like it. I was back at the dealer last week, and they had a new 1/2 ton on the showroom floor. Noticed that the fuel filler door was rectangular, so I opened it. This one was a gasser, but there was a round rubber knock-out plug where a DEF filler neck might go.... Bet they moved it there for the 19's. At least for the 19 1/2 ton diesels.

Honestly I don't think having the DEF filler under the hood would bother me at all. I fill mine once every 10,000 miles or so, so its no biggie, its not something that sneaks up on you all of a sudden you know like a month in advance the gauge reads near empty lol.

I do not like the placement of the tank on the GM's I would have broke one of those by now.

I�ve got a 2016 Chevy Silverado and agree that the DEF fill is a pain to fill being under the hood. What I�ve been doing is having the DEF filled completely every 3000 miles when I change my oil. Very rarely do I have to carry an extra DEF container except for cross country road trips!

3k mile oil changes?

This! I have a 2015 Duramax. I drove 35 miles to the nearest DEF pump for the longest time. Luckily, about 6 months ago they put one in at my nearest gas station. Not only is it 100x easier, they also charge less per gallon out of the pump. If you don't know where the nearest DEF pump is, try locating the nearest pump on this website, just make sure to select to search only pump locations: https://www.discoverdef.com/retail-def-search/ It doesn't show every single DEF pump location, but it shows the vast majority.