I am having similar issues with my 32. I had the wheels blasted and painted 20+ years ago but some of the tubes look as you described. I think if there is any roughness condensation/water will get in the pockets and rust develops causing the issue due to the flexing of the tire. As they fail I have been blasting the rough area and filling so the surface is smooth.  I am hoping that will solve the issue and prevent future problems.

Are you using rim strips? https://cokertire.com/instantsearchplus/result?q=rim+strips

I have taken wheels apart that have had duct tape in place of strips, not sure how well that worked.

Dave

Use tube flaps. You can get them at Tractor Supply, Amazon and others.

@david-dunton The rim strips only fit over the center of the rim to provide protection where the spokes are. My issues are where the very outer edge of the tire bead is in contact with the rim. I do have the rim strips.

@tiny do not see my size on tractor supply site. Have you got some from there do you have a part number. Thanks

I'm not sure what sizes they carry or what size you need. I've heard of folks, but never done it myself, making flaps themselves out of old tubes. Wherever you get them, my point was to use flaps to protect your tubes.

@steve-d  after bead blasting and painting even with the dimples I have put a thousand miles on them and there still up. The next time I have a flat or if I ever have time I will brush a thin layer of liquid flex seal around the rim except the bead area. I did this with an extra rim. After it dried for 2 days it was slightly tacky. So I put baby powder on it and it’s as slick as a baby but. That will be my solution if I have a problem agin.

@kevin-ray I am using body filler on the pits in the bead area. The tire shops do have a product they use when mounting tubeless tires and the bead area is the most important area to treat. I have aluminum wheels on my 2018 Silverado and 2009 Honda and have had leakage on both from oxidation .

@steve-d  I think we are on the same page?. If it’s tubeless the bead area is most important. But on tube tire the tube is pushing against the tire the tire is not needing to seal air. Do you know what the product is the tire shop use, just curious.

@kevin-ray I don't know what my tire shop uses but i did a google search and found several brands. While the tube type tire doesn't require a perfect seal to work any corrosion will eventually work it's way to the area that the tube does contact. I think preventing any water leakage is important to keep rust from forming.