GMC Canyon Pickup as a tow vehicle?

Have been considering a 2019 GMC Canyon to use as a tow vehicle for my 4,000 lb. travel trailer. In past years I've owned two Dodge pickups and learned to love the Cummins under the hood but now as an elderly man I don't want to drive a pickup that big around the city anymore and thus the GMC Canyon. Frankly I've never been much of General Motors fan but after a couple of test drives I'm finding this mid-sized pickup agreeable enough.

My question concerns engine options which are;

1. 2.5L I-4. Not under consideration because it will only tow 3,500 lbs.

2. 3.6L V-6. With a tow capacity of 7,000 lbs. I'm sure this would work but on a test drive I thought the truck felt just a little sluggish.

3. Duramax 2.8L I-4 Diesel. On the test drive this engine felt plenty gritty and I liked it, but then I have always liked diesels. This one has a tow capacity of 7,700 lbs. My main concern is that I know very little about this small Duramax having always been a Cummins fan. Would like to know whatever you can tell me about it. Is it durable, dependable, easily maintainable, any reoccurring issues I should know about? Please share with me whatever you might know about it, both the good and the bad.

Thanks ahead of time for all your input.