There is a great advantage of a brake system, which can be controlled form the tow vehicle, and independent of the tow vehicle. Many of the C Brats own travel trailers, so they do understand the advantages of this breaking system. There is no argument that there are better systems than the surge brakes, but the argument is a system which fails (electro-magnetic brakes) due to salt water corrosion--and you are left with no brakes. I came on a jackknifed pickup with a small travel trailer on its side blocking the AlCan highway--on my only trip up there. The driver told me that he had to stop suddenly for wildlife--and the electric/magnetic brakes on his trailer did not activate.
British Columbia does not allow surge brakes on trailers with weight greater than 6,160 Ibs. Most go with electric over hydraulic--why not electro-magnetic?-- too much chance for failure when used in the salt water environment.
The bad rap of electric brakes is due to a lot of experience with folks using them in salt water, and the iron core rusting out.
Here is a quote about magnetic electric brakes on boat trailers, from one of the large internet after market trailer dealers:
If you want to go to electric brakes you can, but you will need to be sure to rinse the brakes with clear water each time you use the boat in salt water conditions. I normally do not recommend electric brakes in wet conditions but it can be done. Electric brakes will corrode much faster and are not available with galvanized parts like hydraulic drum brakes are. They will definitely need to be maintained.
Three of my friends tried electric brakes for their 21 foot sailboats, and the brakes did not even last thru the summer trip. They rusted and shorted out within 3 months.
Fulton is susposed to make galvanized electric brakes--but there is little about them on the internet. It is very possible that today someone makes brakes which are fully potted in epoxy, but there are always issues with the interface where wires, and the magnetic part of the brake join.
Colby your ideas about electric brakes in salt water might be a bit naive, since you have never experienced the problems with them. There is no interaction with salt water and hydraulic fluid. The surge disc brakes and electric drum brakes are considerably different in construction and materials. It is the corrosive action of the salt water that is the problem. Disc brakes are better than drum brakes both in braking power, and because they are open, and you can clean them well with fresh water after use. SS discs are more prone to warping that steel brakes are. You need a core for the electric brake activator, which is magnetic--SS should not be magnetic. (The way to test for SS, is to carry a magnet, and see if it "sticks".) There are some SS alloys which have partial magnetic properties. Fresh water is far less conductive than salt water.
The better trailer light system will have all sealed connectors (which is what I do with my trailers). There is a dedicated ground wire--rather than relying on the trailer frame. I have gone to all potted LED lights. I have been running boat trailers for over 55 years--and always have some corrosion with lights. Not a thing to do with plugged or not pluged in when immersed.
The basic problem is the same as why salt water trailers are galvanized steel or aluminum--rather than the cheaper painted steel. Steel/iron rusts.
The need for brakes in light trailers might vary with driving habits and trips. The OP posted that the boat was going to be trailered from Vancouver Island to Texas. One would presume that means a lot of fairly high speed driving--and stopping on occasion. The reason I posted the braking distance of the FJ Cruiser was to show the difference in stopping distance in a high speed stop. An extra 57 feet of distance traveled during a hard braking can mean the difference between being safe--and crashing into the vehicle in front of you.
I would much rather have a trailer dragging from behind, than an unbraked trailer pushing me ahead. Granted, it would be best to have both synchronized braking and independent trailer braking for control.
Maybe the best solution is for mangobob is to get a cheap set of electro/magentic brakes (as low as $40 plus shipping per side, plus cost of controller)--and even replace them each year.. could be pretty cheap insurance.