Yeah, DuBro is the other package I was thinking of.
The Maxx and Dubro wheels are almost identical. From memory I think there is a very slight difference between the two with the molding around the hub area. If you compare them closely side by side I think one of them has a little more material widthwise across the hub. I believe it's the Maxx because that's the brand I have a couple sets of in my "inventory". This would make them a bit stronger for our use and also allow some leeway for drilling and adding a bushing if desired. Completely identical otherwise. Not that we can't use either of them, but I think these wheels are more intended for use on lightweight electric models.