The Diesel added a lot to the original cost. It may actually deduct from the resale, since 6.0 was problematic. But, in addition to whatever the mechanics might be, and maybe the noise, two factors we haven't discussed, remain:
1. It was de-tuned in the E-Series, so you don't get the high performance the pickup is known for
2. It takes the Front Axle right to rated capacity, limiting weight carrying and weight distribution opportunities.
Now for what I really wanted to say in this reply, and I'll SHOUT:
YOU HAVE ESTABLISHED THE FEATURES YOU WANT, LIKE THAT BED. DON'T COMPROMISE AND GET SOMETHING THAT DOESN'T MEET YOUR NEED JUST BECAUSE IT'S CLOSE BY OR AVAILABLE NOW.
