Tranny Slipping

Well I have to admit it, I just bought a ’05 660 Grizzly off craigslist and I test drove it around a bit but when I got it home I was pulling it around my house and I was turning to run over my extension ladder which is like 6" tall and when tires hit it, it just stopped and you give it gas and you just hear the tranny spinning. I assume the clutch is gone in it. I can’t believe I didn’t catch it driving it around. Weird, oh well my loss. Can someone point me in the right direction to start trouble shooting. Thanks.