I thought for sure Eddie would chime in here . 39 views and no remarks . That's okay , I have spoke to two diff. manufactures , one of them being Vanco . They both told me the same thing . After major testing , the units perform the same and when driving and applying the brakes , you can't tell the difference . The biggest diff. is between the 4' and 10' canister as the 10' has more volume in an emergency braking condition (as in vehicle being stalled ). Doesn't anyone here run hydro brakes ?