I will second half of what Tom Said, both Blue-OX and Roadmaster are good brands, Features vary from one to the other but I would not hesitate to recommend whichever one you like better.. I won't second Tom on owning Roadmaster though.. I have a Blue-Ox tow bar (In Short, you have now heard from both sides, and we agree)
As to supplemental braking systems on the towed
Laws can be interperted either way I have seen many people who say "it's a car not a trailer" Well.. I happen to believe it is a trailer when it's being towed. and thus needs brakes
However, that's not the law that counts here
IF, and I stress IF you have to stop suddenly (What's the odds of that, something like 100% or at least "Approaches 100%) Well,,,,,, If you have to stop suddenly then the use of supplemental brakes can make as much as a 30% difference in your stopping distance. in short, 100' becomes 70' and if I'm 80' in front of you... That's going to be a BIG difference (Difference between stop in time and CRASH)
And if you run into me, or someone like me, and I find you did not have a supplemental braking system on the towed car... If I survive, my financial worries will be over, cause I"m asking for at least a million for reckless endangerment.
So, consider that when you price the supplemental brake system
Best, for tow vehicles without air brakes (And possible for those with) US-Gear Unified Brake Decelarator (Though there is another system that looks interesting)
If your MH has air brakes.. M&G is kind of interesting