My idea to improve the PSC caboose. Gave up on the lights and did not find the suggested fix (spreading the frame on the truck) for rollabilty a reliable option.
My fix.
Take a Micro-Trains 1185 caboose trucks kit
Shave/file down the provided bolster bushing, leaving just enough so in will not slip through bolster hole.
Mount the truck using screw that came with caboose.
Take note the 1185 bolster hole is not centered between the axels. Orient the truck so the wheels will not jam with the steps of the caboose. Trucks with centered holes will not work.
Hope this will help someone trying to run their PSC caboose.

Note
The 2nd release (Spring 2025) of the PSC caboose does not have this problem as there are no lights and the truck does not have metal inserts for electrical pickup.