My bike came with 20/24 wheels as stock, and at 290lbs they were hopeless. 3 broken spokes, constant need to retrue. I took them off and replaced with 36h wheels.

I moved those onto my new bike, and tried out the 20/24 now I'm down to 250lbs. Nah, still awful.

Maybe @ 220lbs I'll try again.

Do what I did. Ride them, if they're unreliable, get some better quality wheels.