| 3057644 | Telescoping tractor-trailer hitch | October, 1962 | Fisher | 280/478A |
| 2918310 | Towing bar with wide-range hitch | December, 1959 | Carson | D12/162 |
| 2665144 | Vehicle hitch | January, 1954 | Birdwell | 280/515 |
| 2612382 | Trailer stabilizing connection | September, 1952 | Landis | 280/456R |
FIG. 1 is a perspective view of a trailer extension hitch showing my new design.
FIG. 2 is a left side elevation view thereof.
FIG. 3 is a right side elevation view thereof.
FIG. 4 is a rear elevation view thereof.
FIG. 5 is a front elevation view thereof.
FIG. 6 is a bottom plan view thereof.