To fix a mud hole!

[HawkinsHollow]

From what I see in the pics it's pretty clear. You have gotten some really good ideas but I understand the "just a woods road thing" and I also know the "fix it with what I have thing". Sometimes the last is a good thing but at times it may not work in your favor. The big concrete chunks may be one of those things. You said there is a hard base below and that's going to be the problem with those big blocks of concrete because they are going to move around and you will never get the compaction of the top layer that you want. If this was a mud hole that was 5 feet deep with a real mud bottom then those large chunks would be an option......anything to get some kind of solid base so you dont spend a ton of $ trying to fill it with crushed stone. But from what I see you only have a spot that is maybe a foot lower than what is around it. If it were me I would wait until it dries up a little then scrap as much of the loose mud as I could then build it up with that crushed concrete if it is available there.
Here they have what they call #3's which is a little larger than the #1's and I would put the 3's down first about 8" deep and leave it alone for a week or two and let it settle. Take your tractor and run over it to help pack it down a little. The reason I say let it sit for a week or two is to give any mud you leave behind time to settle also. If you do a lot of driving especially with a car or truck right away that mud will work it's way to the top and you will always have a wet spot there. If you put 8" down first layer and let it settle after a couple weeks you could drive a tank over it and it wouldn't leave a mark. After that you could stay with the #3's and build it up until it's above the surrounding area. When you put the 2nd layer down you don't have to be as particular as you need to be with the first layer just lay it down as even as you can a couple inches at a time and then drive over it to seal it off and on to the next layer until you are above the edges. To do this you would probably be better off renting a small skid steer to work the stone because hauling and spreading it with that trailer you have will be a big pain. Don't ask me how I know that but i'll say I have one just like it and most of my projects are done with that little trailer.
I don't think you have as big a problem as you think you do. It probably wouldn't take but 2 or 3 loads of material to get you in the ball park but you already should know that it will be an on going thing to keep it up. Any gravel drive takes work to keep it up even in prime conditions.

Sounds like a a reasonably doable option, thanks!