Thanks everyone for the advice and debate!
So, it sounds like a clamp would be the way to go to get a seal - but I am seeing some people in thread say that clamps don't provide seals and only help secure the tube in place. I guess if it is tightened enough a seal would be possible.
I didn't heat the hose before applying. I don't think I want to go that way.
The hose is the one that comes with the Reefer 170 - the barb was the right size but I am wondering if - due to my set up - having an "3rd party" barb and a RSR tube, there might be a small size discrepancy due to mass production variations?
I'm in Canada and for some reason it is notoriously hard to get some supplies from hardware stores. I would spring for titanium clamps but searching Home Depot, Home Hardware, and Lowes yields 0 results.
@CC13, would you happen to know who sells those? If anyone else knows of a place in up state NY that sells them I could make the 2 hour car ride down.
At this juncture I am going to head to Home Depot, pick up a metal clamp and a new hose. I'm going to applying the metal clamp, if that stops the leak - great, I'll try to find a titanium one and replace it when it arrives. If the leak persists. I'll cut the tube and use a new tube. Hopefully that stops things. I'll keep you guys up to date. Thanks again!