I've said this on the board a number of times: tailgating and parking should be two completely separate things. They may be adjacent to each other, but trying to completely combine them dampens the party in my opinion.
Now, I do realize that it sounds silly to remove the tailgate party from the literal tail gate of a truck or SUV, but
the schools who do it best (roll backwards on the slide show) tend to have tailgates in park-like areas free from cars, push tailgates to the grassy areas at the perimeter of the lots, or have limited access lots for RVs and reserved tailgaters who get there early.
Of course, many of the schools near the top of the linked list above are in warmer climates than Minnesota, so I can see the appeal of being able to hop inside your vehicle to warm up. However, imagine the party if Ski-U-Mah and other areas had a drop off zone for people and equipment. Early arrivers can park and set up the tailgate, then the lot closes two hours prior to the game. Members of your party arriving later could be dropped off with their coolers or chairs. The driver could go park in one of the ramps and take a shuttle back to the tailgate area.
23rd next to the lot could be a 10 minute parking drop off zone once the lot closes to traffic. That's enough time for your friends to carry in their stuff and get back to their car to move it to a parking area rather than a tailgate area. I've also said the grass in front of Mariucci should be made into a tailgate zone similar to Ole Miss' Grove or Bama's Quad, and that the small parking lot at the corner of Oak & 5th would make a perfect loading zone. Same for Williams and McNamara and the small lots there as loading zones.
Combining parking and tailgating means that 90% of your area is devoted to storage of giant hunks of steel and rubber and traffic lanes that aren't really being used to capacity, but have to be reserved for the occasional late-arriver.
An actual tailgate zone can be held in a much smaller area, and creates more of a festive environment. See
this video for examples (ignore the stupid title and that it was shot 3.5 hours prior to the game).
0:27 - 0:38 Tailgate in a park
1:00 - 1:04 RV area with limited vehicle access
1:32 - 1:41 Corporate tailgate area (a vendor who sets up and caters your tailgate for you) behind set
2:28 - 2:32 Another RV area with limited vehicle access
2:36 - 2:54 Tailgating pushed to the grassy areas at the perimeter of a parking area
3:13 - 3:20 Additional corporate tailgate area
0:00 - 0:10 Fraternity tailgate area (bottom center - dirt lot) and additional RV lot with shuttle to stadium (mid-top right) - Might be better seen on
this video.
Or,
this video, starting about 1:20, shows how if you do it right, ALL of your friends will be within a 5 minute walk - you don't have to worry about parking next to each other.
This video, starting around 3:05, shows just how much space is wasted with a parking / tailgate combo.