Here are a few ideas for adjustable camber. I use the 2 bolts welded together at 8 degree angle works well very easy to align.
This is from a Libre Kite buggy
These are the ones I use
These are from Popeye the welder (kite buggies)
I have one set of 27" x 2" big wheels and a set of Barrows which I interchange between my kite buggy and class 5.
The rear axle in the buggy is straight so on that the camber is fixed at 8 deg but because I can rotate the axle section on the class 5 the camber angle is infinitely variable.
Can post more detail pix if needed.