This is from my 1984 19' scamp
I just bought. I only found it because I was replacing the axle
to begin with. I'm guessing the old ones last longer, because mine had angle iron bracing it to the frame. The angle iron was bending up, which cracked the brackets.
Here's what I found when I looked at the old axle
bracket, I guess it's not just new ones cracking out.
If you look 1/2" right from the left side of the torch cut, you can it's starting to crack down from there, as well.
So, go check yours. I'm guessing it's mainly a 5er thing, but it can't hurt to check.
I'm not complaining, it made it until the rubber failed anyway, so it's a moot point.