Patent ID: 7290782

Claim:
A trailer dolly, comprising: a. a horizontal base plate, having a forward end, a rearward end, opposing sides, and a fore and aft axis, said forward end including cable attachment means located on said fore and aft axis; b. a first pair of wheels, said first pair being fixed from rotation about a first vertical axis and having an axis of rotation normal to said fore and aft axis, said first pair of wheels being mounted on a lower side of said base plate, adjacent said rearward end and adjacent said sides on either side of said axis fore and aft axis; c. a second pair of wheels, said second pair being rotatable about a second vertical axis, said second pair of wheels being mounted on said lower side of said base plate, adjacent said forward end and adjacent said sides on either side of said fore and aft axis; and, d. a trailer hitch ball, mounted on an upper side of said base plate, on said fore and aft axis, intermediate said first pair and said second pair of wheels.