Taking a look at Elecbrakes. A wireless electric brake controller. The unit attaches to the trailer and all you need is an app on your phone to control the bra...kes. A good idea I think, provided you have a dedicated phone so nothing gets in the way of being able to immediately apply the manual override in case of sway. Also, some (all?) states prevent you from touching the phone when in transit (refer earlier post on the ACT rules).
Now I can see this coming in use, Where do I order one? eBay has everything! http://rover.ebay.com/rover/1/711-53200-19255-0/1… (affiliate)
Alternatively Amazon... has it as well: https://www.amazon.com/gp/product/B000GTJHO0/ref=as_li_tl… (affiliate)
Also we recommend combining it with this stuff to reduce any slippage: https://www.amazon.com/gp/product/B00BFEJY5W/ref=as_li_tl… (affiliate)
You know you want one!
We built something similar years ago. I wonder if I should dig out my old drawings! Forgot all about this project...