That seems a bit glib, coming from Scamp
(unless they Knew you were going to be towing with a large truck) (which you are not).
For another explanation:
Trailer brakes on our eggs are usually "electric brakes." That's almost certainly what you would be adding (as opposed to hydraulic ones). They are a set of brakes that fit behind the wheels on each side of your trailer, and then wiring comes up to your tow vehicle through the plug you usually plug in with for your tailights (there is an added wire, and maybe a different plug, depending on what you have now).
Then, you have a "controller" unit mounted in your tow vehicle - usually somewhere under the edge of the dashboard where you can reach it while you are driving. Example is "Tekonsha Prodigy" if you want to Google it.
You get the brakes set up so that they work automatically, but then you *can* also apply them "manually" by using the controller.
So now, the trailer is helping to stop your whole rig from behind, instead of your wee car trying to do it all from in front, with the trailer "wanting" to come riding up on you, or worse, jackknifing around.
Unless you are mechanically handy, trailer brakes and the controller are probably something you would have installed for you. Which is not to say they are extremely difficult, but just that it's not something you just clip on and go. I think they would be very, very advisable for your particular TV/trailer combo though.