The concept of a camper's internal livability is very subjective, as a vehicle gets to know each other, each team overcomes minor challenges associated with confined spaces and learns to manage them. Clearly interior width is a result of caravan type and dimensions, and its use depends on the user's build and agility, but constructive attention and engineering of solutions can often make the difference between one model and another.
The space in the "corridor" is important , for example you should open the wardrobe or refrigerator and check that you can easily access the contents, for example, you should check that doors such as refrigerator doors are not obstructed . and bathroom, decide if "some little hurdle" is bearable.
Try the bathroom, lock yourself inside and pretend to brush your teeth, use the toilet, take a shower: can you do everything more or less right? Can you wash your children?
In wardrobes and wall units, space is more related to usability than livability, check if the depth is sufficient (think of a robe or anorak to hang in the wardrobe), it is better for some wall units to also have a shelf that divides the space. interior space (but you can always do it easily), open the cabinets under the sink and stove, probably pots and pans will end there.
What about shoes? In a cabinet that can also be accessed from the inside or in a special cabinet if available. Sometimes the floor has small hidden doors or interior steps that serve the bed, could this be for you?