my experience was with a D-14 it pulled an AC 8ft disk wheel disc fine, but for a pickup disc I had an AC snap couple 7ft disc and that was plenty for the tractor,
it could pull the disc, but at the end anything much heavier than the 7ft would have made the front end too light to steer properly.
both of these disc were AC snap couple.
note: the AC snap couple wheel disc was hard to turn with the under belly hitch.
also if you go with a 3pt hitch disc, there is a big difference in the weight of brands of disc.
Taylorway, Athens, are heavy disc, you can pull them, but may be hard on the tractor to pickup.