The chassis can't be moved easily in CFGs with respect to the pivot point.
It's actually best to export all of the parts as close to the coordinate center as you can get them - e.g. make a standard position to export all front bumpers from, another for all rear bumpers, etc - but not everyone does this.
If you export all of the parts centered to the same pivot, you get something like Blast's SRT-4 where the physics end up weird, and the parts look tiny and far-away in the catalog.
