Staying a few nights in a couple of different RVs will allow you to figure out what layout works best for you and your clan. Some people like the kitchen to face the door so they can see everything that is going on while they are cooking. Some people prefer to have a couch facing the door. Maybe you want the bedroom in the front instead of in the back where a larger number of RVs tend to have them.
When you purchase an RV you don’t generally get to drive it around. Driving an RV is much different from driving the family minivan. A motor home is a very large vehicle. If you decide to purchase a trailer it requires a little practice backing it up as it will go in the opposite direction you think it will. Get some driving practice in with a rental to decide what you are comfortable driving or towing.
Don’t waste money purchasing an RV only to find out it doesn’t really fit your needs or lifestyle. Make sure you really know that this big investment purchase will be something you will enjoy for years to come. Finding out you don’t love your new RV and selling it is costly. Just like buying a new car, an RV depreciates after purchase you wont be able to sell it for what you bought it for.