An improved drop hitch apparatus has at least one hitch plate for coupling to a portion of a hitch assembly of a trailer, a support assembly for supporting the hitch assemblies of a trailer and a towing vehicle, and a mounting assembly for mounting the apparatus to at least a portion of a hitch assembly of a towing vehicle. The drop hitch apparatus is useful as a height adjustment adapter to couple a trailer and a towing vehicle when the trailer has a hitch assembly lower than that of the towing vehicle's hitch assembly. The mounting assembly has a mounting shelf, a mounting bar, a stability member. The support assembly has an upstanding support plate and an upstanding shaft member.