It's easier then you think!
The goal isn't as hard to move as most people (especially those on my team) think. When i was at the kickoff event in my area (Toronto) the goal moves along the floor with little to know effort. I'll admit, when the wheels are turned in a different direction it will be a tad harder but not that much, as long as you use good quality wheels you should be fine. 
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"Remember that time your dog ate my goldfish, and then you told me i never had a goldfish? Why'd I have the bowl Bart, Why'd i have the bowl?"
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