Ah, the owner's manual. Is it a veritable compendium of automotive and off-road wisdom, or is it a kluged together Frankenstein's monster of the legal and marketing departments? (Pop Quiz: Question No. 1 - How many warning and caution boxes are in the manual? Question No. 2 - How many superlatives are in the manual?)
Personally, I sincerely doubt that going 10,000 miles between oil changes is sound vehicular maintenance. It's not just the mileage, it's also the age of the oil. As oil ages it gets increasingly acidic, and acid is BAD. But it's also the mileage. As oil runs through the engine it is subject to sheering, and that progressively turns 5W-20 motor oil into 4W-15, then 3W-10, etc. The longer you let it go, the poorer the lubrication, the poorer the protection, and the more acidic the oil becomes. This is why we do oil changes.
The first oil change is particularly critical because the break-in process produces a lot more particulents in the oil than after the break-in is complete. Those particles accumulate in the filter and reduce its efficiency. (Oh yes, the filter ages too.)
But if you don't care, then just drain out all the oil and run it dry. It'll run for a while. And if you care a little, then don't change the oil. It'll run for a while longer. It's your truck - make yourself happy.