Update, last week the trailer was for sale in Ikea here in Madrid and I bought it for 160 eur.

It is far more useful I thought, strong and light. Nothing near to a "sporty" or "speedy", it's for daily use as a cargo helper. I use it a lot, most of the times just pulling it by hand.

I am surprised because I use it a lot, very very handful.

The problem is that, once again, the doors of my house are very narrow (well, I believe they are just standard doors) and it's some extra work to load the trailer outside my house, I have to lift and rotate the trailer to exit my house.

It is exactly what I needed and I am very happy.