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when i put them on my '19 i looked at a lot of threads, and went with gatorbacks and have been happy.
research the threads, they have been discussed. there are a few options availible in flaps from diffrent makers.
I put Husky flaps on my '21 as well as my brothers. I drilled the extra optional holes in mine but not on his and they are both very solidly mounted. Conversely to SeniorRVer above, I actually like that they don't hang low. They are low enough to deflect debris down to under the steps, which is all the lower they need to be in my opinion.
I have Rok Blokz mud flaps. If you plan on leveling your truck and having aftermarket wheels with more offset, they are the way to go. They looked kind of silly IMO when I have stock wheels and tires. My wheels are +12 offset and the flaps cover perfectly.