Interesting replies.
Picture a light Harbor Freight trailer with two small ATVs being pulled by a 1990 Toyota PU with a fiberglass shell on the back. Now do a panic stop at 45 mph and have that very light trailer combo, jack knife you.
One thing people don't understand about trailers is, they push the back of your vehicle up when heavy braking. Now that you made the back of your tow rig lighter, if your not stopping straight, you can be pushed sideways. I have also had this happen towing my jeep on a tow bar behind my dually with a 4000 lb Lance camper.
People can go through life and never have a problem, that's fine. I have had issues. When I do, I research and try to figure out how not to have this ever happen again.
On my M-100, before the RTT, driving down a steep soft hill, the 700 lb trailer kept trying to push the back of my TJ sideways. Swapped the axle for one with brakes and never looked back.
All my trailers will have brakes no matter how light. The key to this whole mess is the controller. I also run the Prodigy controllers. Most opinions I have read over the years are based on people who have only tried one or two designs, listened to their "friend" and or used older out dated systems.
When it comes to my gear and my vehicles, I don't want any issues. My OCD kicks in and I go out of my way to make it what I consider correct and safe for me. As I stated earlier, peoples opinions will vary. For most, once they get bit by something they will either blame what bit them or find out why. Its easier to blame what bit them.
Also, I didn't watch the video at the beginning, I'm at work and its hard to watch them here.