That lip, isn't advisable for jacking a truck up with.. Its a body panel pinch weld, where the panels are joined together. A lot of people seem to like having the LineX bedliner coated under there, doing the lip front and rear and lower section of the rockers for paint protection. Some just use mudflaps.
Up here in Canada I'm a firm believer in Krown. My 2003 with over 400k on it still literally looks like the day I sold it back in 2007. And for a dodge truck box to still be intact here, thats a big deal! Lol
My 2016 was done the day it was landed, and I'm only likely to keep it for another 4 or 5 months (be 3yrs old then) but I still think everything should be done in Krown coating. It works very well.
Sometimes in the hot summer days, it'll drip a bit (I get it sprayed every Oct before I leave to go down south) and being a white truck, washing it more often helps keep black residue from dirt etc building up, but you see plenty of people who don't and its a mess. AS terrible as an unkept vehicle may look.. It won't rust! Haha