This reminds me of an old station wagon my fraternity brothers & I acquired to ride in, I think the Homecoming parade. We cut the roof off, used thick visqueen to rig a "wading pool" filled with water, with several of us "wading" in it as we drove through the parade. I think we may also have "decorated" it with paint & slogans similar to what was done in Animal House.
Had way too much fun in college. MSU used to hold an event for the Greeks called "Bacchanalia". As part of it each frat & sorority would pick a representative to travel to all the parties hosted by the frats, voting on who threw the best party. We won the first 2. I was a part of the 1st. What a fun group of guys! Even though I have matured since then, I really miss those days and those guys.