Using A Trailer in Spain

I know that Spanish trailers have their own Ficha Tecnica but do they have their own registration plate? Or does the trailer have to display the number of the towing vehicle. Also do they require their own insurance. Basically can I tow someone elses which does not have my car reg number on it. Do I also have to carry the documents for the trailer??

yes the trailer should have its own plates and yes you should carry any documents with you.

as for seperate insurance i have no idea but more than likely since they have theor own registration.

Up to 750kgs the trailer has a ficha tecnica butdoes not need it's own registration ,except if you are using it in a business. It is also covered on the vehicle insurance except when used in a business. Over 750 kg carrying capacity it needs to be registered with  it's own , red, number plate as well as the towing vehicles number plate fitted.  In addition it has to be insured seperately & is subject to road tax as well. Yes you should always have all documents with you & if you are towing a registered trailer then you also need a letter from the owner stating that you have permission to be using it.

Thanks Delza and guslopez. That has answered a few questions for me

Can I use my uk car pull my uk 2500kg trailer with mini digger on the roads out there, without problems. I plan to take it to Ibiza from the uk to do my garden.

I was then thinking of leaving it there for a few years and only towing it on the road occasionally with my uk registered car ( that isn't driven for more than 6 months!). I should expect a bit of hassle but do you think I would be doing anything wrong. Being Uk the trailer has no mot or tax as would a spanish one.

I was also thinking of moving there for a few months to do the garden, if I picked up a bit of garden/digging work during that time it might come in handy before returning to the uk.