David, first off, welcome to the Airforums! You have your post in the proper place....
I think you should be sure to have the batteries ready for towing home. The emergency brake operates with the battery (should, heaven forbid, you lose the trailer off the hitch!). As to your lights, I'm sure someone will chime in here to let you know what sizes you need for the running lights & tail lights. I have an '86
Sovereign & the bulbs were available at the auto store (just don't know the size or name of them). It might not be a dumb idea to just pick up a temporary light set from Harbor Freight (or something similar) just in case they aren't working. You could always return them if they do work.