Towing a trailor

[Danny2009]

Reading on direct gov just confuses me.

I've got a recovery truck and can carry a total of 3.5t

But I don't use it often enough and it's just another set of tax test and insurance

So I'm thinking of sellin it and buying a braked trailor and getting a tow bar fitted to car

But what's the legalities? I have the new licence

Can I have 3.5t including towing car trailor and vehicle on trailor?

Read somewhere about only being able to tow 750kg

Any help will be appreciated