2019-2021 Warlocks are all the same. Its the same as all 4th Gen Rams. Which can be really nice sometimes, but a pain in trying to figure out what parts.
Ive got the bils at 2.8 on my quad cab. with the bed completely empty she sits an inch bed high. With my tri-fold cover and around 100lbs of assorted tools and such, she sits level.
This is the Part # for the Bils: - Bilstein 24-187367 5100 Series
295/60R20, 295/65R20, 285/65R20 would all fit no problem. Most likely you could also do 35x12.5R20 on the stock wheels and you wouldn't rub. I know the KO2's run a bit small and fit. The Dealership I bought mine from does the bils at 2.8 with the 35x12.5R20 KO2's with some of their warlocks sitting on the lot.
Here is mine with 35x12.5R17 on rebel 17X8 rims. These have the same backspacing as the 20x8 rims that come stock on the warlock.
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You can see how close it is though. However no rubbing.
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Here are 315/70R17 Grabbers on with 1.25in hubcentric wheel Spacers
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I say go for the bils! if you ever want to go higher you can, and you can re-use them in the lift.