" Many states requiring trailer heavier than 2000/3000 lbs to have their own brakes."
Actually, depending on the state laws, it is more like 1500 lbs UNLADEN weight, or 3000 lbs GROSS weight. The law is also likely to require a breakaway braking system that is capable of setting the TRAILER brakes and holding them set for at least 15 minutes, AND the TRAILER must have brakes on ALL wheels.
THEN, you need to look at the legal definition of "TRAILER". Many states have a legal definition that states a TRAILER is DESIGNED for hauling PROPERTY and for being towed behind a motor vehicle.
I don't think a passenger vehicle quite meets that definition. Even a pickup truck doesn't meet the definition.
Many states have a "Braking Performance Law". If you can stop within a certain distance from a certain speed on the specified surface, you are legal.
What is the law in YOUR state? If you don't know, you might want to look it up.
Keep in mind that braking laws are usually NOT "reciprocal". You have to meet the requirements of the law in the state in which you are traveling!
