My 52 panel....dual MC with small booster mounted under the foor, from Pirate Jack in Asheville N.C. worked great the 7 years I drove it. With the dual MC one chamber is larger than the other and I plumbed the large one to the front brake. Used a 10 lb residual valve on rear brake line. The brakes would stand it on its nose. (Shoes on all 4 wheels)