Toilet's Full

"Toilet's Full" is a sidequest of Episode 4: Ho Ho HOOD.

How to obtain the quest
Talk with Ben in his RV in the southernmost area of Shadow Valley Town (a bit left from the southern park entrance) to start the sidequest. 

Walkthrough
"Ben has managed to completely fill the waste tank in his RV. Since he can't leave his vehicle, he has asked you to attach the waste hose to a storm drain outside."

Objective: Find a storm drain.
You can find the storm drain next to the southern park entrance. Press the action/interact button on your keyboard/joystick to complete the objective. 

Objective: Return to Ben.
Return to Ben in his RV to complete the sidequest. You'll be awarded with 300 XP.