I have been having some problems with the Trinity hopper couplers and wanted to see if there might be something I can do to help stop the uncoupling problems. The problem seems to be when you have a long train with a lot of cars behind the Genesis cars and slow down the weight must cause the coupler to lock open. Being that kadee couplers won't drop in I can't easily change them to kadee without major modifications I am looking for a better fix. I could make sure they are always in the back, but after spending that much money on them they should perform at least as good as my $5.00 kits and not need to be relegated to the rear of the train! I have only run these cars a few times (maybe seven or eight times around the club layout) with the problem starting the last three or four outings. Please help!!