full 3.5tons. You are likely to be needing a bigger vehicle.

Unfortunatly to get this kind of towing load, the towing vehicle is
probably going to exceed 3.5tons MGW anyway, which puts you into the
7.5ton category. Now not only do you need category C1 on your licence,
but you are going to require a tacho to do it commercially.

If you're thinking of doing this commercially as a business you'd be
far better off getting a flatbed/beavertail recovery vehicle rather
than going for car+trailer

Alex

Probably then getting into the realms of needing an Operators Licence which
needs a CPC in Road Transport.