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I have two new Bachmann EMD GP40 large scale modern diesel locomotives 1:29 scale (item number 91903) that I want to pull a few cars with each. The first car is a Bachmann Big Haulers Jackson Sharp coach (item number 92711). The stock knuckle couplers on each are at different heights and keep uncoupling.

I thought to convert to hook & loop couplers which have always been more reliable for me (and I don't care that they don't look as prototypical. Reliable is more important to me.) But I can't get them to fit on the GP40. Is hook & loop possible on the GP40?

Alternatively, should I stay with knuckles and adjust the height somehow? It's about a half inch mismatch. Styrene shims to angle the trailing coupler up to match the GP40?

Thanks,
Curt