walnutz

Hello all, my dad would be considered a Clydesdale. Currently, his rear wheel keeps coming out of true, and a few spokes even popped out recently. I think it is because is kinda heavy, and the way he rides all the weight is on the rear. Are there any suggestions for heavy duty wheels/spokes?

Have I completely misdiagnosed the problem? As far as I know, he rides on smooth roads and paved trails, I don't think he is hitting any major bumps or anything that would knock the wheel out of true.

Thanks in advance.