You can find replacement trucks from previous run that match the ones on your new husky stacks. They have hidden uncoupling tabs and are sprung. They aren't cheap for a set though.
I'm glad I loaded up on the previous release husky stacks with no thumbtacks. And they included a bunch of BN and SF containers across the line which I don't see in new run.
I did get 1 new TTX EOT car to match my 5 TTX cars from the last run. Although not perfect, Lionel decided to go from 6 digit to 5 digit road numbers on the new TTX (black logo) cars. I'd like to remove thumbtacks also but it has power pickups and eot mounted to side of coupler.