Hobbies for Cash

Do full timers do hobbies that they turn into cash when they are parked in RV parks? Is it worth the time or is it a worthless hassle?:huh:

Many RV'ers have hobbies that they generate cash from. However, it just can't be as easy as setting up a table or putting up a sign on your RV in a RV Park. Many RV parks have restrictions against this. People I know sell hobby items by word of mouth, through the Internet, or at craft shows.

What kind of things do people make and sell?