Years ago when I worked with trailers a lot we used a rule to determine if trailer brakes were needed. That rule was: "If the trailer weighed less than half the weight of the TV the trailer did not need brakes". Today many new vehicles weigh less than the older ones did. For example the Subaru Forrester weighs just under 3,300 LBS. Using the above rule, that Forrester is just borderline, at best with a Scamp 13. (I think the weight of Scamps shown in the catalogs is under what they really weigh!) In my opinion that means that a Scamp 13 should have brakes if the TV is a Forrester. Our TV weighs about 4,000 LBS. Our 13 Scamp does not have brakes. We feel that our TV does well at braking. The other part of the equation is how you drive. You need to be willing to keep your speed down, follow at a greater distance, brake early, and down shift (even with an automatic!) as needed while towing.
Hope this is helpful