I have a 5' 4" x12' landscape trailer. 6 years old. New tires. 3500 lb axle, torsion suspension, crank up wheel/foot welded to unit.. Well built with tubular steel where many just use angle iron, costs about $1200 new. But the expanded metal on the ramp needs replacing. Otherwise in fine shape. I also feel like I need to get trailer brakes for safety. I like the size, which isn't that common, since I can fit two full size mowers on it and the width of the wheels matches my pickup, so it's less trouble to keep on the road. I also would prefer not to deal with two sets of tires. Should I fix my trailer ramp and upgrade the brakes or just sell it for a few hundred and apply that towards a new trailer? What does it cost to upgrade to a simple trailer brake system, including brakes, controller, etc? A do-it-yourself project or best left to pros?