Sorry but that's not dirty. Show us a picture of the bx stuck past the axles in mud and the L towing it out while spinning its wheels!
I had the L in mud upto it's front axle and the rears pretty deep a while back . I have a spot were the ground is always soft and muddy. You can see it compress as the tractor drives across it. I don't think the BX had been in the mud yet.