I didn’t find the OEM mud flaps to be very effective against rock chips. I ordered the front and rear set of tuffskinz flaps from Cali raised LED for a total of about $100. I like the look, and hopefully this deflects a lot of the rock chips on the bed, though it’s a little late for this truck...
The Leer 180 I ordered arrived after 8 weeks. I’m fairly pleased with it aside from the fact that none of the premium window options were available for the 4th gen.