I have a BD3, and I can tell you that its hard to beat. I cannot see why you would want to add another system. It is RARE that I take a chuck in the drivers seat. The biggest problem and it is hardly a problem is when I get on a segmented highway and the segments are evenly spaced, then it is possible to develop a kind of looping but if I slow down a little bit it goes away. I have experienced this when not towing also, so I'm not really sure that it's related to towing. And I don't know if you would eliminate that with any combination of pin boxes and hitches. More things = more money = more maintenance. Spend money on good tires. There are plenty of good safety mods that can be done that will get you more bang for the buck.