The mat in my '15 was put in my '00 when it was new. It's been in 3pickups since '00.I have a bed mat that's probably 20 years old and weights a 100 lbs I swear lol. That's my bed liner for now. It's been in 5 of my last trucks. Im totally pleased with my linex experience on the last truck.
I regularly pull 12k with a 6.2. just locally for working, I don't use it for vacation ( rv lifestyle type stuff) . The new trans and proper gearing does make it a lot better though ! We have a 2016 6.7 and locally they do the same work for us. Long haul the diesel is better!
6.2l wood work pretty good in urban areas were speeds are low and no real inclines, but I don't live in a urban area or drive in them unless I'm passing through.