Picts look like rims good. Very little experience with big wheels but having built bike wheels with a hand full of spokes I know you can't just do one spoke and make it true, gotta chase it around. With tires off put em on and spin to see how straight they are. The spokes on my wheels were all frozen but pretty true. I left them alone and did not free. Since have broken a couple spokes and just replaced. If close just replace the "thonks" since they are probably bad anyway. If not true make a mailbox post holder, oh yea, California guy, probably haven't seen that.