93 days, 14 hours, 29 minutes until Rolling the Twisties!
At less then 100 days, please ensure that your cars are going to be up to snuff for the trip. I suggest:
Making sure your brakes are in good order with fresh fluid
A fresh oil change
A freshly cleaned or new air filter
Fresh transmission and final drive fluid
Making sure you have adequate tire tread depth
Make sure your suspension is in good order, check those lower control arms
Your fuel system including transfer pump are in working order
A valve adjustment has been performed
You have a spare parts kit between your group (see this thread, wkohler has it bang on:
http://www.mye28.com/viewtopic.php?p=405474#405474)
This stuff should be easy for a DIYer to perform and will insure up-most reliability when running the twisties. With these suggestions, you should be able to overcome any common E28 problem that you would encounter when running the trip.
We look forward to seeing you at RTT!