I have Yoke AVS S/T's on my VX and it did just fine on the trails last year. Like Bumble said, there's plenty of folk that will be there so, you shouldn't have a problem catching a ride if you end up not driving.
Here's the CB I installed. Very small and discrete and with a magnetic mount, simple. Click the pic for more...
CB's are isted on the mandatory list by the 'ZuZoo crew for saftey more than anything. Some of up use FRS also for side conversation without interrupting the main channel.
Here's a prep list from a previous year