If you work on the basis that there are no locations to fill with LPG/Bulk in Spain, and plan as such, you will be OK. If you do find a place [actual, not word of mouth], let everyone else know.
What gas bottles do you have-Calor?--you cant refill them or any other bottle only exchange & Calor is UK only--you could of course get Spanish bottles(& regulator) but I think you have to pay for an inspection of your caravan/camper first-the only bottles that are exchagable Europe wide are Campingaz(small & expensive)the other alternative is Gaslow refillable bottles that can be refilled at service stations that do automotive LPG--expensive to start with & only viable(imho)if you do regular extended tours of Europe
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We regularly fill up our gas bottles with LPG in France, mainly at Total garages. - no problem - we attach our adaptor to our filler inlet, which is fixed on the outside of our camper, which means we do not have to take out the gas bottles. The question is are there many outlets in Spain? We will be in Tarifa, then going on to Morocco. - do you know of any outlets there??
Oh I see! you have built in arrangement--well if nobody can answer your question all you can do is try & suss out the Repsol website---you could try emailing them in Spanish using babelfishthey are the main Spanish fuel suppliers- there is also Cepsa