I found my load bearing vest to be too cumbersome when trying to crawl. Remember that anything you put on your chest is likely to get smashed when laying prone. Your best bet is a battle belt.
At the weekend battle I played earlier this month, I found that the only things I needed were a radio, pistol, and 2 spare magazines. Everything else I had intended to carry got in the way. You don't want to inhibit your movement in any way.