If your Equal-i-zer is still functioning well, why change it out. At least give it a try on your new rig for a time or two and see how it behaves. Why spend money if you don't need to.
I had an old style Reese (bars with the chains) I used for over 10 years on 3 different trailers and 3 different truck combinations. One day I realized the hitch was a little loose and needed to tighten the bolts. Finding a socket large enough was my problem. After several attempts at several different places, I went back to my RV dealer. They had the right tool. But it was then I found my hitch head was bent. Nothing was wrong with the bars, but the actual spot where the hitch ball mounted was bent. And the bolts would not tighten the hitch head snug. The whole thing was bent. That's when I switched and got an Equal-i-zer myself and I've been happy with it ever since.
So, my suggestion, if it isn't broke, don't change yet. If and when you see signs of wear or fatigue, or something begins to bend, THEN start looking for a new one. That's my 2 cents!