I studied our 1510D and the drawbar is too short to use for anything other than part of the 3 point hitch - so I'm going to see what I can get made up.
So far the most practical solution looks like a "Z" shaped extention. About 4" wide by 1/4" thick and maybe 14" long overall. Two holes punched in one end (for bolts to fasten it to the existing drawbar), a slope down (6" or 8" drop), than a straight extention with a 1" hole for the trailor ball with rings welded on each side for the chains.
cvt