The tipheads we are carting into are bogholes at the moment.
This one has been levelled off and looks easy. But it is full of soft spots and liquid mud under the top thin crust.
This is where my truck can use it's party piece to become unstuck.
You raise the tray, then slide it back lifting the whole rear of the truck off the ground and out of the hole.
Then by lowering the tray & sliding it out further you can push the whole truck forward about 4 metres at a time.
One must remember to have the handbrake on.
Or you become triumphantly unstuck, and the truck happily rolls off into the distance.
Don't ask me how I know that ...