ok well this is kinda obvious but like no one does it... when the guy dies and you smash his pumkin have a bunch of other accounts ready in that town to go get the pumpkin and mail the items back to your main, i got like 15 brooms and 54 jackolanterns from doing this and deleting the accounts and making new ones then mailing back and sold jackolanterns 3g each and brooms about 10g each and made like 250g on a lvl 22 account lol
BASICALLY: Have a bunch of characters in whatever town you want, must be where The Horsemans Shade strikes, and perhaps in the same town, wait for the guy to come, then kill him, smash pumpkin, log onto another char, smash pumpkin and so on, it works.