hi, yes I agree the jockeys are best for cruising but at rest the bench would be far better - only space for 1 sunbather on the back bench. A solution is to buy a big flat donut thing & use it as a lilo - more sunbathing space at no cost & you can keep the jockeys. I´ve seen them online for 100 GBP & will pick one up on next UK visit.
Re non Spanish cars & towing the law is that over 750 kg you need separate ITV & regn for the trailor, I have a UK Bramber & it cannot be legalised in Spain. Bramber are happy with UK sales so haven´t gone for Spanish homoligation, a pain but that´s life. Anyway, I got a similar Spanish trailor made up locally & have the plaque & paperwork for that (Ficha technica). When the plaque on the copy gets a bit corroded I´m going to put that on the Bramber so it has effectively been legalised, by me of course.
The Spanish legal trailor looks like a load of pipecleaners by comparison to the Bramber so I will keep it as a spare, minus the plaque of course.
I have yet to be stopped by the police but I know someone who has - towing non Spanish trailor with Spanish car - it´s a 600e fine so be warned. The alternative if you are caught with a Belgian reg car with no tax MOT etc, ie, illegal in the home country, is impoundment. Basically, you won´t get it back.
Hope it helps, anything else just ask. Spansih love their bureaucracy & if you ask 3 people advice you willñ get 4 different answers. Above took me 2 months of chasing around to clarify.