Which fender flares did you go with? I went with non oem ones (red rock) and I have to warm them up and bend them a bit, so the plastic lines right up with the body of the truck. If not, I would get gaps. Also, I have to figure out what I want to do with the plastic trim pieces at the bottom edge that I removed to get the aftermarket flares on. Don't like the paint being exposed like that, but I do wash the truck enough to not worry about rust.
I have some minor gaps on them, but I need to pull them off and heat them up again. Here in south jersey, as you know salt and winters can get rough.
2022 Ram Big Horn Back Country
2016 Dodge Charger scat pack
2021 Jeep Wrangler Unlimited Sahara