95van,

Thanks for your input. The term "oscillating" is a bit strange, I admit. I think that is is used by the technical people that design big rig components. I am confident no marketing person would use that term as it sounds bad, especially in a discussion of trailer stability.

Now that you mention it, I remember the word "rocker" (not the best term either!). I did not spend too much time on non-Holland sites, because that brand was already pre-selected for me.

I guess the question for people with rockers that can be locked out, is:

When to you lock it out and when to you let it "rock"?