If you use your bucket, you are sure to bend it. Pull those rocks from your tow bar. A skid will surely help. I pulled a huge stump with my CK25 that weigedt more than I could move with either the bucket or backhoe, and didn't skid. She pulled it, but it was a struggle to maintain traction and move it about 100 feet. Skidding would have made things much easier.
Don't be ashamed of using those rocks for landscaping. Some folks pay big money for big rocks. I just bought one to use instead of a diving board for my pool. It cost me nearly $700 delivered, and is worth every penny because it is beautiful and will never need maintenance. I know a man who operates a stone quarry, and he regularly gets $1000 to $1500 for really large, flat rocks. My rock is about the size of a small garden tractor; weighs 5180 lbs - purple granite like rock called Mount St. Mary's. So, don't underestimate how heavy they can be. I wouldn't think about dragging that beast around without a skid - digs into the ground too much. A skid will save you time and wear on your tractor.