I studied RVs for 5 years before I took the actual plunge into ownership. I had a list of "Must Haves" and actually wrote them down on a piece of paper. My list of "Must Haves" was very short, yours may be a bit longer based on your needs, and a long list of "Must Haves" will most likely increase your expense and your search time.
#1. Must be less than $30K
#2. Must have adequate kitchen space to store all necessities (including food) and be able to prepare a meal in the space provided.
#3. Must have adequate closet storage for full time living.
#4. Must have washer/dryer hookups
I got all of my "Must Haves" in my C Class except for #4. When I saw my RV, I was instantly in love. So, I guess, the washer/dryer wasn't really a "Must Have" after all, but more like a "REALLY Want". I haven't seen one RV on the road, in brochures, or in a park that I was jealous of. One day, when the time comes to put this RV out to pasture, I will find that "perfect" RV, but for now, this one is close enough to perfect for me.