From the Green Bay Packers website: Link Here
The Lambeau Field parking lot opens four hours prior to kickoff. The entire stadium lot is sold out to holders of season parking passes with the exception of a limited number of first come, first served parking for people with disabilities. Reserved season parking customers must enter the lot at the entrance indicated on their parking pass and follow the directions given by the parking attendants. No busses, R.V.'s or oversized vehicles are allowed in the Lambeau Field lot. For information on season parking, or to be added to the waiting list for season parking passes in the Lambeau Field lot, please contact the Packers Ticket Office at (920) 569-7501.
Additional reserved parking is also available nearby on an individual game basis. For information please call (800) 895-0071 or visit Ticket Star :: Home
In addition to the reserved parking options listed above, free parking is available on many residential streets bordering Ridge Road, Oneida Street, and Lombardi Avenue within walking distance of the stadium, and many private property owners in the vicinity offer parking for a fee.
So, it looks like no RV tailgating