I want to be able to work on the frame on it's own this winter and the only way to do that right now is to strip down everything on the hemi TJ (pull the engine, tub, etc). If i can work on the frame on it's own while possibly still working on the rest of the TJ (I.E. finishing up the engine, cage, body trim, etc....) at the same time is well worth the extra cost for a 2nd frame IMO.