First of it's great that you are coming down to the Purdue game. I hope you have a great time and I am more than happy to answer any question you might have.
If you get into WL on Thursday night going to the Neon Cactus is a must. It's where everybody goes on Thursday, they have a good size dance floor and a great piano bar. For Friday and Saturday night the best bars are on Chauncey Hill. It is literally right next to campus. The Chocolate Shop that Bandanna Guy referred to is Harry's while it is always packed on Friday and Saturday nights it is a classic at Purdue that has been there since 1924 roughly. To me it is a great place to go with a couple of friends and have a few drinks and just talk. There is also Brother's(I believe there is also one in the the Twin Cities) which has become the frat boy hangout. Where Else which is more hard core party bar is right next door. Also there is Jake's which is more sit and have a drink place. All four are within 3 blocks of each other so a bar crawl is easy.
As for food after a few too many drinks Bandanna hit the nail on the head with XXX. It is a Purdue classic and few blocks away from the bars. I recommend the "Duane Pervis Burger", which does have peanut butter on it, which is crazy good get the onion rings and a root beer and you are set. Also there is a "Drew Brees All-American Breakfast" which is HUGE. I once saw a couple of football players linemen come in and they just finished it.
Saturday morning, if you are awake I recommend going back to Chauncey to go to Breakfast Club. All the students over 21 get dressed up in Halloween costumes and go out to the bars which open at like 6 AM. It is quite the sight, you see everything. The Pope, Teenage Mutant Ninja Turtles, literally anything you can think of.
After that tailgating is recommended depending on what your plan is the best place to tailgate is on the IM Gold fields which is about 15-25 minute walk from Ross-Ade depending where you park. I think its like $5 per car, which isn't bad. As for the RV, I honestly can't answer that for you I don't know enough about it.
2 hours before the game the Purdue All-American Marching Band plays a concert on Slater Hill which is about 5-10 minutes from the IM Gold Fields. I suggest getting to the game early enough to see the marching bands pre-game show which is always great. It's full of tradition and I would put pretty good money on a fly-over. (Purdue is very well noted for its Aero and Astro Engineering programs.) Tickets shouldn't be a problem at all, there will plenty on the street. If you are a basketball fan you should check out the renovations to Mackey(right next door to Ross-Ade, see link at the bottom for more info on the Mackey project.)
After the game the marching bands plays on the front steps of Hovde Hall(main admin building) right next the big fountain you see in every Purdue ad.
If you have any other question I would be glad to answer them for you. Sorry, it took a little while for me to get back to you, classes started today so I was busy being quite board reading sylibuses. Overall Purdue should be a great road trip(or at least much better than going to Bloomington), and while the sport here is basketball(currently) our football team should be pretty good(bowl game for sure, hoping to back door our way into the BCS, see Illinois 2007?).
We have a QB transfer from Miami named Robert Marve who everyone is raving about, a great receiving corp, and some studs on D, see Kerrigan, Ryan. Although there are few holes(parts of the O-line, the entire secondary) but it should be a good year for the Old Gold and Black.
http://www.purduesports.com/genrel/mackey-project.html