You'll likely be fine on the Express. Have never had a problem being slightly over, and half the boat is divers. That said, it's been a few years since I did it last (tend to take boats out of Long Beach these days to hit the islands).
As I recall, the hand truck was a schlep but there were plenty of them. Golf cart seemed convenient as I was pulling a few hundred pounds in a cart in the hot sun, but probably good for my heart :-)
Enjoy, it's a beautiful location.
Check out the LAUE Ghost Fishing Project's footage of their cleanup of the Infidel if you want to see what it looks like at 150' just a (long) stone's throw from the casino at Avalon.
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