It is possible, you might need an adaptor harness just to get the lights to work though? (I added them to my 16 but not sure what your 20 tradesman has connector wise?)
And yes you can get blind spot working, but it's not plug and play. You will need to run additional wires back to to the cab and plug into the canbus, as well as the BCM. Then add wires to the door modules, add the correct mirror glass and enable all the functions in the BCM. That's kind of the quick and dirty of it. It's a fair amount of work