Hi Ryan,
I certainly don't mean to criticize 3000 mile OCI's. You definately won't hurt anything except maybe you're wallet & the effort it takes to do those changes.
I've been extending my OCI's trying to get more "bang for my buck" out of the oil & filters. Was changing at 5000. Went into the 6000 range then 7000. My last change was at 9626 miles & the oil was still good, as confirmed by UOA (Chev. Delo-400, 15X40, CI-4+).
When I started to extend the intervals, I started doing UOA's to make sure I wasn't hurting anything. It's, certainly, not worth doing if you are going to damage your expensive engine.
One of the things that started me thinking about extended oil drain intervals was when I read, in the TDR, about a couple that towed, commercially, & changed their oil every 5000 miles (Rotella & Fleetguard filters). They had 1,153,000 on the engine without a rebuild. I was changing at 4000 miles, at that time. I, immediately, extended to 5000 miles. There's no way I'll ever see that many miles on any of my engines.
In your case, I know you love your truck & there is such a thing as that "warm, fuzzy feeling" that you get by REALLY taking care of your truck. That has value, also.
So, I'm not asking you to follow my advice but, I believe you could stretch the intervals, a bit, safely.
Joe F. (Buffalo)