yeah, you probably need to rent a small back hoe and get those out, if you can fit a tractor back there. that's a lot to do with a shovel. just out of curiosity, what are you planning to do with these beds?
My set up:
-2007 Chevy 2500hd 8.1l 4x4
-7x18 enclosed trailer
-Grasshopper front mount 61", gravely 52"
-36" Gravely Walkbehind, 21" exmark push mower