Though I hope my unfinished as yet TTT comes in light enough NOT to need brakes, if I have to add them later it'll be electric drums. After years of hauling my cars and other cargo with my 18 foot car/equipment trailer (at first with brakes on one axle, then after an axle/springs rebuild, on both axles), I come to depend on my electric drums. Being prone to both neglecting brake maintenance and overloading my trailer, the infinitely adjusting control is great. If my trailer sits too long between uses, and the drums get rusted, then I can just drag them smooth and clean while getting underway (via manual override). If my load seems too much for my normal settings, then I can crank them up for more stopping power. And if I get in stop-and-go traffic, I can turn the power down and stop by my truck's brakes alone or use the manual override on the trailer brakes, and haul my truck to a stop that way. Lots of options. I always check out my wife's travel trailer brakes before she tows though; she just wants to stop, not make decisions on how to use the system. I recommend a digital display/proportional brake controller, if you want to use varying repeatable settings, or an inertial/analog system for set and forget usage.
'09 HHR LS Panel 2.2l, '66 Chevelle Malibu 7.3l (10.7sec-1/4mi), '04 Silverado 2500HD 6.0l, '98 GMC 1500 5.7l, '08 Cobalt SE 2.2l, '92 Achieva SC quad4 2.3l, '88 Fiero 2.5l, '07 Puma TT,'13(probable finish) TTT