Here's some tip to take into consideration when choosing your camper van
What is your Budget?
Consider your budget - it will be determined by age of vehicle, milage, condition, type, model etc.
What size vehicle do I need?
You should choose one which has enough space for all your passegers while driving and while occupying the vehicle.
Most countries in Europe will require that all adults in the vehicle be wearing a seat belt. Make sure your vehicle has enough seat belts for all passengers.
Something that you find easy to drive.
Number of passengers and beds (berths)
For a couple a camper, car derived van or small panel van is a good option.
Generally a motorhome is a good option for 2 couples or 4 individuals or for someone who wants more space while travelling.