Here are 2 places to check for job openings:
http://www.workamper.com/ (requires a paid subscription to see job postings) and
http://www.workampingjobs.com/index.php (free).
Fair number of hours is always subjective. At some state/federal parks, the hosts have the only FHU site in the campground and don't have stay limitations. Or you could work at an RV park only a few miles from close relatives. Or just be in a great area of the country.
Since you mentioned side business, should we assume that you'll need reliable Internet access without driving 20 miles to find the nearest hotspot?
