Mobile home sites come under 2 categories, camping/camp sites and residential style parks. Residential style parks are for mobile homes only, an example is Parque La Posada in Alameda. Camp sites that offer both normal camping as well as mobile homes for example Camping Valle Niza tend to be nearer the coast and ironically more expensive with less facilities that suit living all year round as a resident. Camp sites can also be restricted in the number of mobile homes they can have in relation to the number of plots that they have on the park. Rule of thumb is no more than 30%. Owning a mobile home in Spain is not a problem, there are 100’s who live in one all year round near Antequera alone.
All you need do is make sure you have done your homework and choose a good mobile home park. Type in “mobile home spain” on google and you will see sites that offer various mobile home parks and all you need to do to make sure you will not end up on a problem park as far as living in a mobile home as a resident is concerned is to ask the question “does the site allow camping or sub letting?”. If the answer is yes to both you know it is a camp site first and mobile home park second. If the website you contacted is also offering you parks all over Spain the chances are most of them are camp sites/mobile home parks as there are not that many dedicated mobile home parks in Spain. In truth, if you have a mobile home on a park that you wished it was not on then relocating it to a dedicated mobile home park would make sense.