Camp Hosts are typically in Parks ( State, COE etc) You might want to check out Workamper News. It is a network of and for workampers across the country. It has an online resume service, job search service, and the ability to network with workampers the web address is:
Also try http://dreamers.workamper.com
very similar to workamper.com, but an little more polished web design and a little more focused on planning your workamping career, kind of preparing you to be "living the dream".
Lastly, if you can stand to stay in KOA's they are the largest employer of workampers. They periodically sponsor job fairs, and Work Kamper University which is to train workampers to work in KOA's in the various jobs around the KOA parks i.e. grounds maintenance, service desk, general maintenance etc. It also serves as a good resume builder, because trust me you are not going to want be locked into all KOA, all the time. Private CG owner/managers like the resume and letters of reference from previous CGs in picking you over someone else. For a fee, as I recall, of around $35 KOA will allow you to post your resume and availabilty on KOA website for their camp mangers who are looking for workampers. Typical assignments are 30 to 60 days. and KOA provides up to 5 nights free camping to help cover the cost between assignments. If your are interested in KOA their website is:http://workatkoa.com
There are lots of other similar websites but, I hope this helps to get you started, best of luck.