John, this may not be what you wish to do. But you said you were curious as to what others do. I intentionally drill out the trucks held with rivets and I will explain my reasoning.
Most rolling stock with trucks held by a rivet have quite a bit of slop in the tightness of the truck to the car body. If you pick up a piece of rolling stock, you can grab the coupler and jiggle it up and down quite a bit.
By necessity and choice, I use 027 track, and was experiencing common derailments when pushing a train in reverse. When trucks are loose and you are pushing a train backwards through 027 curves, the loose attachment of the trucks will allow the wheels to ride upwards over a curve or through a switch, and especially on "S" curves. Now, "S" curves are a basic layout no-no, but when you have a small layout, compromises are necessary. My quest became not to change the layout design, but to alter the trains so they would not derail.
So I drill out the rivets on anything that is excessively loose and replace the rivet with a truss screw and a stop or lock nut. I tighten this all the way, and then loosen it just enough so the truck swings top the left and right freely with a absolute minimum of up and down jiggle movement of the truck.
I've thus practically eliminated derailments** when pushing a train backwards. And this includes very light MPC era short cars pushing much heavier cars with sheet metal frames with die cast trucks. It makes running the trains much more fun!
Now depending on the type of car, I vary the truss screw. On a box car, a silver truss screw is fine. For flat cars, gondolas etc. I sometimes use a pre-blackened hex screw. I've also used nylon or steel truss screws that are painted to the color of the car body.
** The other factor for derailments is wheel sets being out of gauge with the wheel sets on the same truck... a bigger factor when buying used trains with fast angle wheel sets. I make sure the wheel sets on one single truck are in alignment with each other. They can be slightly out of alignment between two trucks on the same car, but not out of two wheel sets on the same truck.