From CHiPs Online:
Driving home, some Alpha Alpha Omega fraternity brothers are headed towards a tunnel in their motor home. Jon notices they're over the height limit and our heroes chase after them. The motor home scrapes some scaffolding and stops just at the entrance to the tunnel. Somehow, the motor home catches on fire. Jon saves a trapped frat brother while Ponch puts out the fire and finds quite a bit of pot.
After the frat brothers' trial, Ponch and Jon return to Central for the briefing. Meanwhile, the frat brothers scheme revenge on the CHP. Later, Ponch and Jon run across an abandoned VW Beetle in the middle of the road with a letter addressed to Ponch in it. Later, Ponch gets more letters based on nursery rhymes. Everyone's confused by them.
On patrol, the frat brothers pass Ponch and Jon. When our favorite officers chase them, the frat brothers start dumping play money on the freeway. It causes an accident and everyone jumps out to grab some cash.
After stopping by Central, Ponch and Jon return to the streets and find the convertible that dumped the cash. They chase it to Travel Town where the two frat brothers try to hide in trains. Ponch and Jon find them and go visit them and their other frat brothers when off duty.
While the CHP sets up for the open house, the frat brothers have girls from Gamma Delta Phi making brownies. Back at the open house, everything is going fine and the CHP motorcycle drill team performs. During the performance, Jon somehow figures out the riddle and tells Ponch. They catch the frat brothers and destroy a few open house booths in the process. The next morning, Getraer reads a commendation for Baker but gives a damage bill to Ponch.