Archer,
The oldest and probably best magazine is Motorhome. It has lots of informative articles, both technical and nontechnical, as well as articles about places to visit. We started subscribing many years ago to both it and its sister publication Trailer Life and eventually dropped the one on trailers. I still enjoy reading this magazine even after all these years and often keep the travel articles for future reference.
If you join FMCA or Escapees you will get their magazines. Escapees is great for fulltimers but its membership is comprised of people who own all types of RVs, not just motorhomes. Some manufacturers like Monaco also have their own publications that are sent to owners.
There are other smaller magazines that are RVing oriented, but not motorhome specific. The only two that are specific to motorhomes are Motorhome and FMCA's Family Motor Coaching.
ArdraF