I don't have it so can't recommend it, but found it interesting. As of the date of this posting it is on sale 15% off.
http://www.etrailer.com/dept-pg-Ball_Mounts-co-Built~In_TW_Scale-pm-Weigh_Safe.aspx?utm_source=iContact&utm_medium=email&utm_campaign=etrailer&utm_content=161212-BalM-WeighS-Manuf