There will be a good group of Jeeps from the Mudstruck club at this event. The swap meets are usually pretty good as well.
More information at http://www.mudstruck.com/forum/showthread.php?6-April-7th-mud-run-swap-meet
More information at http://www.mudstruck.com/forum/showthread.php?6-April-7th-mud-run-swap-meet