I would use that price discrepancy of $800 cost vs. $270 credit in your price negotiations. That's ridiculous! There was some discussion about the R53 Pathys without the tow package not having the tranny cooler. For what it's worth though, if you think you'll do any towing at all, just get the tow package. Adding it later will only be extra aggravation and give you a 3500 lb. max towing capacity.