RC facts (and 'facts')
A Google search for Looney Tunes references to Cucamonga (how many people can consider something like this part of their job duties?) turned up a "Did You Know?" page about Rancho Cucamonga from a tree service directory, of all places. Here's the link.
I suspect all the "facts" aren't 100 percent accurate. The trivia note that Frank Zappa made Cucamonga "his part-time residence for much of the '60s and '70s" makes it sound like he had a summer home there, when in reality he lived there about a year circa '64. So caveat emptor -- but much of the other info sounds right.

A journalist for more than two decades, David Allen has been writing a column for the 

They spelled Cucamonga wrong at the top of the darn page but got it right everywhere else. haha
I definitely remember the Camp Cucamonga movie as well as the more recent Dr. Pepper commercial which showed us on a weather map.
It was referenced on the Dharma & Greg tv show shortly after the Camp Cucamonga movie I believe.
In online forums where I indicate my City of residence, I still catch myself writing "Rancho Cucamonga (yes, it is a real place)".