We're shorter @ 36' and use a Demco tow dolly with surge brakes that I'm happy with. Use it to tow a Lexus RX350 SUV. Also have towed our 24' boat with the MH and it has surge brakes on the trailer as well. I can't compare to electric brakes but there seems to be very little, if any, difference in perceived stopping distance when towing (or maybe I'm just more careful).
However, I do notice a difference when I'm towing the Jeep Wrangler 4-down and not using an auxillary braking system (like I should).