I'll take LeeandRicks flamesuit and double it.
My opinion (and almost nobody agrees with me) is..... electric drum brakes for the trailer. Why? They're as simple as simple can be and super cheap to boot. Yes, they'll corrode (in salt) and require more frequent replacement. But there's nothing easier to do than replace a set of trailer brakes and did I mention it's cheap? Particularly if your tow vehicle has an integrated brake controller (Like a Ford pickup with the tow package will).
Electric over hydraulic is 'better'. But more expensive. And I hate surge brakes. I wanna be able to reach down to the controller and put the brakes on and make sure they work. So cheapie electric drums and replace em when they stop working is my opinion. (And very few others will share that opinion)