I certainly agree with FLOOR PLAN.
If you are going to do a lot of traveling, make sure slides don't interfere with access to bath and fridge.
When we head to Florida for the winter, it is nice to be able to go in our camper to sit down and eat lunch and use the john.
Also, we can "over-night" in our camper without having to open it all up.
Since we spend about 4 months living in our camper, it was VERY important that it have a FULL SIZED FRIDGE and an OVEN. Many of the newer campers have tiny little fridges and no oven.