Welcome to the Eriba Forum.
Eriba caravans have long lives and because of this they are blessed with ultra low deprecation.
This can be both a blessing and a curse. The curse is that buying one to start with will not be cheap, but later if and when you decide to sell, you will be blessed.
Like everything, you need to consider what is important to you in terms of sleeping arrangements, if you want a washroom or not, a separate dining table (which negates the need to convert beds into seating each day and visa versa) and obviously space and weight.
Eriba's are not a light as people suspect, in particular bigger/ later models, but your car should be fine with most models. This website is worth looking at to help you decide:
https://towcar.info/GB/You should find everything you need to know about Eriba caravans here, so good luck in your research.