While I believe I understand your dilemma. The site you show does not appear to be that extreme. I expected worse.
You have a relatively short block of wood of wood on the ground to start with. Get a few 6x6 blocks and put them down to start with. Stack the 6x6 blocks as necessary. You can also use Lego blocks to gain height instead of the 6x6 blocks if you prefer.
Extend the inner leg of your front jacks. It appears they are not extended very far in the photo?
One point I think I'm missing that is not shown in the photos is how much clearance do you have between jacks and ground before you start unhitching?
I'm thinking that may be the root of the problem that is not evident in the photos.
