I have a heavy trailer that has electric brakes on the 2 axles. I think it's surge brakes as the trailer has it's own 12 volt battery supply. No battery in it now as I bought the trailer as salvage and it still sits where I parked it years ago. I have it up on blocks so that the weight is off the weird "springs" that it has. I think it is a 10 ton trailer. It has ramps that fold up. It was used for hauling a skid steer on. It needs the wood deck replaced, some lights, 2 tires as there are only 2 on it and I have the other pair of rims for it. I might just as well clean it up and trade it off as I have no plans for it's use anymore. I keep forgeting that I even have such things as out of sight out of mind,lol...