I have read some people saying that you should bring a rolling suitcase, bu BEA has clearly stated that no rolling suitcases are allowed inside of Javits, so I am kinda confused.
The Javits Center has bag check areas where you can check the intended massive suitcase. No, you can't bring it on the floor but you can go back to it while it's checked and drop stuff off throughout the day. That makes security seem kind of lax but it's a trust thing. I wouldn't worry about it. Plus it's a nice relief on your shoulders.
Have fun at BEA, everyone! And I hope to see some of you there!