The BLM free camping areas are what they call "Dispersed Camping", they have no services or service stations, pick a hunk of terrain and set up house keeping. You can only camp for 14 days, then are required to move on, you can move to another BLM dispersed camping area that is at least 25 miles away an stay for another 14 days free. The BLM "Long Term Visitor (LTV)" areas are located all around "Q" also, some have water, dump, and garbage stations, or some combination thereof, some have no services at all but you can drive to an area that has services and utilize them free of charge. These LTV areas all charge a fee, you can either buy a 14 day permit (which is renewable) or a seasonal permit which is good for the entire winter season, both allow you to access any LTV area.
I have stayed at several of the dispersed areas in the recent years, prefer Road Runner area which is 5 miles south of "Q" off of HWY 95. Not as rocky as the dispersed areas to the North of "Q" a bit further out of town, therefore not as crowded as areas closer to town, especially during the RV, Craft and Car shows. Have never stay in any of the dispersed areas to the east or west of town. Have also stayed in the dispersed areas north of Lake Havasu.
Here is a LINK
to the AZ BLM camping web page! Hope this helps.