you wont know if its done its job until you peek down the intake ports into the head. catch cans only catch liquids, but when you heat the oil it becomes a vapor, and the catch-can does nothing but bypass oil vapor into the the manifold where it condenses and expands in a much cooler part of the motor.. This is where it condenses back to oil residue, only to get baked on the hot valves. towing will create a hotter oil and more oil gaseous vapor. the next simplest upgrade would be a 180 t-stat to keep the oil cool and less off gassing of vapor past the PCV. after that an oil cooler would help too.
the amazon CC, with the added steel wool might improve condensate to drop out before reaching the manifold
IMO the only guys who needs the catch-can is the racer or street truck that's revving the motor or any boosted application.
i bought into the hype year ago, and I do have a catch-can on my truck. it only produces about a tablespoon full of recovered oil every month. and I have installed a 175 t-stat to keep the oil and motor cool about 4 months ago.