This is nothing new, just a refresher on how easy it is to convert these reefers to Kadee couplers. For 2 rail operation, just swap the wheel sets to NWSL.
Cars, Kadee 740 couplers, 3D printed spacers with pre-drilled holes and available in black from Shapeways, stick on wheel weights, cordless drill with #50 and #43 drill bits, screw driver and 1/2" screws
Remove trucks, make 2 cuts with your Dremel to remove the claw. I painted the trucks with cheap flat black.
Add 3 oz of stick on weights... this will be 1/2 oz over the NMRA standard at 16 oz total, but I would rather them be a little over weight than under.
I tape the doors closed from the inside. they don't always want to stay closed.
Put the floor back in the shell, drill your holes for the Kadee and use 1/2" screws to mount with spacer.
Spacers put the coupler at the perfect height.
5-10 minutes per car total. Easy, fast, cheap, and looks 100 times better! The spacers take all the guess work out.