A work rack structure for correcting and aligning misshapen vehicle frame and body portions having a modular structure consisting of several parts joinable and detachable to each other in a variety of combinations, including: (a) a main rack structure frame part consisting of a pair of parallel tread members connected to each other by means of at least two cross bars underlying said tread members, (b) support bars for pulling equipment, each of which is telescopically slidable in said cross bars, (c) means for locking each of said support bar in a chosen position in its related cross bar, and (d) a jack-support carriage mounted for sliding movement between said tread members and above said cross bars. A method to set up the vehicle on the rack structure is also disclosed.
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