[folivier]

The difference between a 2 slide and 4 slide coach is basically you get more floorspace and maybe a bit more cabinet storage. For my wife and I a 2 slide is very comfortable. When you add 2 more slides on the passenger side then you start losing space in your camp site. Also the basements on that side are more difficult to get to.
And if you want a 4 slide coach then close up all slides and walk around and decide if you will be comfortable while traveling. There are some places where we overnight and don't open the slides. If you think that fits your lifestyle then make sure you can access whatever you need with the slides closed. Again it all depends on your lifestyle.
You just need to get out there and see some coaches. Most of the coaches at the factory will be mid to late 2000s with 3-4 slides. Although there might be a 2 slide there hiding.