We just attended the Life on Wheels classes in Tucson this week (March 15, 2007), which we highly recommend. They also present these three-day sessions in other cities, but their home base is Moscow, Idaho, where the sessions are five days. The founder and one of the teachers is Gaylord Maxwell. They offered about nine or ten different classes during each period of one and one-half hours, plus three evening entertainment presentations (well, one was a free lasagna dinner at Beaudry's). There was no organized selling and instructors observed the no-selling rules.
We found the instructors and the materials taught to be excellent. Their instruction was top notch for what we wanted, which was introductory information and some nuts and bolts how-to's. They also have many available details classes and fun, travel-oriented classes. Many of the students were newbies, but there were many experienced RVers -- some for decades. Quite a few had attended multiple times before. Very well worth it!