After reading up on couplers I want to go with kadees. It would be nice to go with the bodymount set up but Im not sure it will work with my loco (sd70mac USA) I will likely need to put a few 9ft dia. curves in my layout. If going to 10 ft would make the difference then it might be possible. So assuming that I need the truck mount type on my cars what kadee couplers number do i need? I would like to keed the modification to a minimum. Not that I cant mod but if they make one that is bolt on that would be great. Thanks, Larry