"Check the states you will be traveling through, many require a braking system on anything over 2000lbs.
Yes, definitely check the laws in the states you will be traveling through. If for no other reason, because the above statement just is not true!
DO NOT, however, put any trust in any so-called "List Of Towing laws" on the internet. I have looked at a lot of them, and I have yet to see one that I would rely on to be accurate!
For example, many such lists say that Montana has "No law regarding" braking on a towed vehicle. Actually, Montana Code Annotated is quite specific; a towed vehicle does not meet the legal definition of a "trailer" (MCA 61-1-101), so trailer braking laws do not apply. However, ANY combination of vehicles must be able to stop within 40 feet from 20 MPH on a level, clean, hard, dry surface (MCA 61-9-312).