I may be late here, but I fitted Kadee couplings to a Bachmann BR horsebox, and yes, the couplings drooped. So, not wishing to destroy a perfectly good chassis,I bent up a THIN brass rod to support the coupling at the right height. On its roof the coupling sits at the correct height which is where I set it. Works for me. Be warned, the wire support needs to allow the coupling block to swing. Trial and error! DON'T do what I did, some superglue crept into both wheel cutouts, which stopped the wheels revolving...Doh! Out with a Dremel. Superglue dries hard....