Depends on where you are going in Elkhart.. Myself, I overnighted at the Moose, being a member (NO RV facilities but a nice big parking lot with lights)
I've also overnighted at the factory (The Warranty Service Plant for Damon) while awaiting the service technician.. I had an appointment so they had a power cord for me. Very nice.
Several other manufactures have places for you to park provided your rig bears their name of course.
I can not help you with campgrunds... but there are a bunch about.
Home is where I park it!