Patent ID: 7556466

Claim:
A trailer comprising: (i) a trailer frame supported by ground engaging wheels and attached thereto; (ii) a pivot frame which pivot frame is pivotally attached to the trailer frame by pivot attachment joints whereby the pivot frame is pivotable relative to the trailer frame and which trailer frame remains substantially in a horizontal plane during movement of the pivot frame and when the pivot frame is in a retracted position it overlies the trailer frame in abutment therewith and parallel thereto and when in an extended or operational position it is pivoted upwardly relative to the trailer frame; (iii) a separate support plate oriented transversely to the pivot frame and located at a rear end of the pivot frame, said support plate being located completely below the pivot frame and spaced therefrom by a pair of opposed and upstanding attachment lugs which are releasably attached to the pivot frame so that when the support plate lies on a support surface to facilitate movement or loading of maintenance apparatus onto the support plate, said pivot frame is located above the support surface and is oriented at an acute angle to the support surface.