things to look for when buying a used moomba

I'm heading out tomorrow afternoon to check out a 2000 moomba outback with 135 hrs and clean as a whistle. Wanted to know what I should look for. I'm not sure if I'll be able to get it in the water immediatly, but could I start it on the trailer (sounds like a bad idea to me, but what do I know). Is this kind of like buying a car? looking for leaks in the trans (where is it??)?
Any help would be appreciated.

thanks,
dj