The whole "resale value" thing makes me roll my eyes every time I see it.
You put $9000 in when you buy it, but you're not going to get $9000 out of it when you go to sell it. It's called DEPRECIATION.
If I don't spend the $9000 in the first place, I have it to invest or do whatever I want with it. Very good chance I come out of it with MORE than $9000, something that would never happen if I spent it on the truck. Even better if I didn't have it in the first place (i.e. financed) because then I don't have to come up with it every month as I make payments.
The other thing that makes me question my sanity is why anyone would think that any of the HD gas engines these days would have any trouble whatsoever hauling any size TC.