We were truly full timers for more than 4 years. We had no home other than our fiver. We found out right away we did not have to all the time make reservations. In fact, getting locked into a program can be a real pain in the butt and we were glad we never got into a program. However we did become golden at KOA campgrounds. Back in those days golden meant you had stayed at them often enough to qualify for their 15% discount. We mostly stayed at them a lot because they were available, easy to get into and out of and almost always had FHU facilities. Keep in mind that our budget was a bit higher than the average and we never boondocked or even considered it.
We set our travel days at 300 miles. At 200 miles we started watching billboards and checking our campground guide. Many of the places we stayed at were not advertised and we found them from watching roadside advertisements. (I'll bet today with Google being on just about every cell phone, its real easy to find and call ahead for site info).
We did make reservations when we decided to stop for a couple of months and rest. We did that up north in the summer time and somewhere down south in the winter. We did ME, NH, VT, NY, ND and CA in the summer and mostly CA, AZ, TX and FL in the winter.
During those years we visited all of the lower 48 and 3 or 4 CDN provinces.
Here is a link to a blog with short stories about 90 of the places we stayed at.
Clicking on any of the pictures in the blog will enlarge them.
http://fasteaglervparking.blogspot.com