Just heard back from JJUSA; see here and check with your Trail Guides, too
JJUSA wrote:
...They must have mirror brackets for mirror relocation in order to remove their doors. On some trails we don't allow doors to be removed. It's up the Trail Guides...
Program questions? Read our event FAQ, contact Jeep Jamboree USA directly, or call (800) 925-JEEP for additional copies of the Jeep Jamboree USA 2008 Guidebook.