If the trailer has a GVWR of 1,500 pounds or more, trailer brakes are recommended. Otherwise your SUVs brake system is likely to be dealing with loads beyond its design limits. Surge brakes have their own hydraulic system, and operate when the vehicle slows suddenly. Electric brakes are wired into the tow vehicles power system and operate when you put your foot on the brake. A hand-crank winch is indespensible for getting a boat out of the water and back on the trailer.
Power winches are handier, but add to complexity and expense.
Like vehicles, winches have load ratings. Be sure that your boat is well within the load rating of the winch. A winch cable that snaps under excess strain can produce nasty injuries. Retractable tongue jack. Most trailers of any size have this devicea crank-operated jack with a little caster at the bottom.