Knock on wood my '16 Freightliner Cascadia hasn't gelled, but that's on the company if it does. Carry either 9-1-1 or Melt Down if it does. However, Howes has come out w/ a product that's supposed to be better than 911 or Melt down in the even you gell up. IMO, looks darn good to me. Sadly, at time of this writing, I forgot the name of it.
As for pick ups, gelled up 2x w/ 2 different trucks. My '03 6.0 which we all know the filters were a PITA to change, but was surprised it did so anyways. 5 years ago, my '15 gelled up and being new to Ford's DEF system and all, I didn't know what was going on. Dealer couldn't get me in, but suggested their sister dealer (Lincoln) to have them look at it. Did so and they were the ones who told me it gelled up and wanted close to 400 bucks for diagnosing and new filters and all. Told them no way in H*** am I paying that. Was able to drive home and got my own filters for MUCH less. Anyways, root cause was about 5 gallons I bought day or 2 before from some gas station which I didn't add additive to, but filled up at regular stop before getting home and where I did add additive. Then temps dropped like a rock w/ temps below 0 and stayed there. So despite adding anti-gel, wasn't enough to counter the 5 gallons surpringly. So now at around late Nov or so, I start adding anti-gel and fuel at same stop all them time.